CN111551867B - Battery service life detection method and device, and battery replacement reminding method and device - Google Patents

Abstract

The embodiments of the present disclosure provide a battery life detection method and device, and a battery replacement reminder method and device, wherein the battery life detection method includes: obtaining the voltage cliff drop time point of the battery when it is newly shipped; obtaining the current battery voltage cliff drop time point; and, based on the new factory and the current battery voltage cliff drop time point, the current battery remaining power storage capacity is obtained. In the embodiment of the present disclosure, considering that the voltage cliff drop time points of the same battery are different in different use periods, the change of the battery service life can be obtained by comparing the voltage cliff drop time points of the new battery and the current battery, so as to obtain the current battery life. The remaining power storage capacity of the battery can objectively and accurately detect the battery life without discharging the battery. It is more practical and suitable for users to test the battery life on a daily basis.

Description

Battery life detection method and device, and battery replacement reminder method and device

technical field

The present disclosure relates to the technical field of battery detection, and in particular, to a battery life detection method, a battery life detection device, a battery replacement reminder method, and a battery replacement reminder device.

Background technique

The most sensitive thing for mobile phone users in daily use is the remaining power of the battery. Once the battery is close to its service life, its power storage capacity will suddenly change from 50% to 10% during use, which is unpredictable. Bring a lot of trouble to users. However, it is difficult for ordinary users to objectively and accurately judge whether their mobile phone battery has reached the end of its life and whether the battery cell needs to be replaced.

At present, the conventional method of battery life testing is to use professional testing institutions and rely on professional instruments to test the battery life of charge and discharge, measure the battery discharge through an ammeter, and then calculate the percentage of the battery discharge to the rated battery capacity, and finally get its remaining useful life. For example, when the maximum charge and discharge capacity of the battery/the rated capacity of the battery is less than 30%, it means that the remaining life (power storage capacity) of the battery is less than 0.3 of the original value and needs to be replaced. This detection technology requires professional equipment to detect the current. Although the detection results are relatively accurate, it cannot be applied to the user's daily mobile phone usage scenarios due to the need to continuously measure the battery discharge current, and it cannot become a widely applicable daily battery life detection. method.

Therefore, it is an urgent problem to propose a solution that can objectively and accurately detect the battery life without charging and discharging detection of the battery.

SUMMARY OF THE INVENTION

The present disclosure has been made to at least partially solve the technical problems existing in the prior art.

According to an aspect of the embodiments of the present disclosure, there is provided a battery life detection method, the method comprising:

Obtain the voltage cliff drop time point of the battery when it is new from the factory;

Obtain the voltage cliff time point of the current battery; and,

The remaining power storage capacity of the current battery is obtained based on the time point of the new factory and the voltage cliff drop of the current battery.

Optionally, the remaining power storage capacity of the current battery is obtained based on the time point when the voltage of the new factory and the current battery falls off the cliff, and the following formula is used to obtain:

Z=Tn/T1

Among them, Z represents the remaining power storage capacity of the current battery, T1 represents the voltage cliff drop time point of the new battery, and Tn represents the current battery voltage cliff drop time point.

Optionally, for a new factory battery or a current battery, obtain the battery voltage cliff drop time point, including:

Obtain the voltage change curve during battery use;

According to the voltage change curve during battery use, the voltage change rate of the battery at each time point is obtained; and,

The time point corresponding to the voltage change rate greater than the preset first threshold value is found from the voltage change rate at each time point of the battery, and the time point is taken as the time point when the battery voltage falls off the cliff.

Optionally, the voltage change rate of the battery at each time point is obtained by a slope calculation method, or a derivative calculation method.

According to another aspect of the embodiments of the present disclosure, a battery replacement reminder method is provided, the method comprising:

Using the aforementioned battery life detection method to obtain the current remaining battery storage capacity; and,

It is judged whether the current remaining power storage capacity of the battery is less than a preset second threshold, and if so, the user is prompted to replace the battery.

According to yet another aspect of the embodiments of the present disclosure, there is provided a battery life detection device, the device comprising:

The first acquisition module, which is used to acquire the time point of the voltage cliff drop of the battery when it is newly shipped;

a second acquisition module, which is used to acquire the current voltage cliff drop time point of the battery; and,

The detection module is used to obtain the remaining power storage capacity of the current battery based on the time point when the voltage of the battery is newly shipped and the current voltage cliff drops.

Optionally, the detection module uses the following formula to obtain the current remaining power storage capacity of the battery:

Z=Tn/T1

Among them, Z represents the remaining power storage capacity of the current battery, T1 represents the voltage cliff drop time point of the new battery, and Tn represents the current battery voltage cliff drop time point.

Optionally, the first obtaining module includes:

a first obtaining unit, which is used to obtain a voltage change curve during the use of the new factory battery;

a first determination unit, which is used to obtain the voltage change rate of the newly-produced battery at each time point according to the voltage change curve during the use of the newly-produced battery; and,

The first search unit, which is used to find the time point corresponding to the voltage change rate greater than the preset first threshold from the voltage change rate of the newly-produced battery at each time point, and use the time point as the time point for the voltage cliff drop of the newly-produced battery ;

The second acquisition module includes:

a second acquisition unit, which is used to acquire the voltage change curve during the current battery use process;

a second determining unit, configured to obtain the voltage change rate of the current battery at each time point according to the voltage change curve during the current battery use; and,

The second search unit is used to find the time point corresponding to the voltage change rate greater than the preset first threshold from the current battery voltage change rate at each time point, and use the time point as the current battery voltage cliff drop time point.

Optionally, the first determination unit specifically adopts a slope calculation method or a derivative calculation method to obtain the voltage change rate of the new battery at each time point; the second determination unit specifically adopts a slope calculation method or a derivative calculation method. The voltage change rate at each time point of the current battery is obtained by means of the method.

According to yet another aspect of the embodiments of the present disclosure, there is provided a battery replacement reminder device, the device comprising:

The aforementioned battery life detection device, which is used to obtain the current remaining power storage capacity of the battery; and,

A reminder module, which is used to determine whether the current remaining power storage capacity of the battery is less than a preset second threshold, and if so, prompt the user to replace the battery.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

In the battery life detection method provided by the embodiments of the present disclosure, considering that the voltage cliff drop time points of the same battery are different in different use periods, the battery life time can be obtained by comparing the voltage cliff drop time points of the new battery and the current battery. The battery life can be measured objectively and accurately without discharging the battery. It is more practical and suitable for users to test the battery life on a daily basis.

Other features and advantages of the present disclosure will be set forth in the description that follows, and in part will be apparent from the description, or will be learned by practice of the present disclosure. The objectives and other advantages of the present disclosure may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions of the present disclosure, and constitute a part of the specification. They are used to explain the technical solutions of the present disclosure together with the embodiments of the present disclosure, and do not constitute a limitation on the technical solutions of the present disclosure.

FIG. 1 is a schematic flowchart of a battery life detection method according to an embodiment of the present disclosure;

Figure 2 is a comparison diagram of the voltage change curve of the same battery in the factory state and near the service life state;

3 is a schematic flowchart of a battery replacement reminder method provided by an embodiment of the present disclosure;

FIG. 4 is a structural block diagram of a battery life detection device according to an embodiment of the present disclosure;

FIG. 5 is a structural block diagram of a battery replacement reminder device according to an embodiment of the present disclosure.

Detailed ways

In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure more clear, the specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, but not to limit the present disclosure.

It should be noted that the terms "first", "second", etc. in the description and claims of the present disclosure and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence; Also, the embodiments of the present disclosure and the features of the embodiments may be arbitrarily combined with each other without conflict.

In the following description, suffixes such as 'module', 'component' or 'unit' used to represent elements are used only to facilitate the description of the present disclosure, and have no specific meaning per se. Thus, "module", "component" or "unit" may be used interchangeably.

FIG. 1 is a schematic flowchart of a battery life detection method according to an embodiment of the present disclosure. As shown in FIG. 1 , the method includes the following steps S101 to S103.

S101. Obtain the voltage cliff drop time point of the new battery when it leaves the factory;

S102. Obtain the current battery voltage cliff drop time point;

S103. Obtain the remaining power storage capacity of the current battery (ie, the remaining life of the current battery) based on the new factory and the current voltage cliff drop time point of the battery.

Among them, an important measure that can most clearly reflect the battery's power storage capacity during the use of the battery is the battery output voltage. When the battery power is about to run out, its output voltage will drop sharply, which is called a voltage cliff drop. And the time point when the battery output voltage drops sharply is the time point when the battery voltage falls off the cliff. The new battery refers to the battery in the early stage of use. Compared with the battery that has been used for a period of time, the battery at this time has the longest remaining life; the current battery refers to the battery that has been used for a period of time.

In the embodiment of the present disclosure, considering that the voltage cliff drop time points of the same battery are different in different use periods, the change of the battery service life can be obtained by comparing the voltage cliff drop time points of the new battery and the current battery. The current battery's remaining power storage capacity can be detected objectively and accurately without discharging the battery. It is more practical and suitable for users to test the battery life on a daily basis.

In one embodiment, step S103 uses the following formula to obtain the current remaining battery storage capacity:

Z=Tn/T1

Among them, Z represents the remaining power storage capacity of the current battery, T1 represents the voltage cliff drop time point of the new battery, and Tn represents the current battery voltage cliff drop time point.

In one embodiment, step S101 includes the following steps S101-1 to S101-3.

S101-1. Obtain the voltage change curve of the new factory battery during use;

S101-2. According to the voltage change curve of the new factory battery during use, the voltage change rate of the new factory battery at each time point is obtained;

S101-3. Find the time point corresponding to the voltage change rate greater than the preset first threshold from the voltage change rate of the newly-produced battery at each time point, and use the time point as the time point for the voltage cliff drop of the newly-produced battery. The first threshold can be set by those skilled in the art according to the actual situation.

In the embodiment of the present disclosure, by monitoring the voltage change rate at each time point of the newly-produced battery in real time, the time point when the voltage of the newly-produced battery falls off the cliff can be found out.

In one embodiment, step S102 includes the following steps S102-1 to S102-3.

S102-1. Obtain the voltage change curve during the current battery use process;

S102-2. Obtain the voltage change rate of the current battery at each time point according to the voltage change curve in the current battery use process;

S102-3. Find the time point corresponding to the voltage change rate greater than the preset first threshold from the voltage change rate at each time point of the current battery, and use the time point as the current battery voltage cliff drop time point.

In the embodiment of the present disclosure, by monitoring the voltage change rate at each time point of the current battery in real time, the current time point when the battery voltage falls off the cliff can be found out.

In the embodiment of the present disclosure, the battery voltage variation curve can be obtained by a voltage sensor installed inside the mobile phone. It should be noted that the current detection device used to detect the current size during daily use is generally not installed inside the mobile phone, because there are potential safety hazards such as short circuit and power running.

Figure 2 is a comparison diagram of the voltage change curve of the same battery in the factory state and the state near the service life. As shown in Figure 2, the horizontal axis t represents the time, the vertical axis y represents the battery voltage, the solid line represents the voltage change curve of the battery in the factory state, the dotted line represents the voltage change curve of the battery near the service life, and T1 represents the new battery. The time point when the battery voltage falls off the cliff when it leaves the factory, and T2 represents the time when the battery voltage falls off the cliff when it is close to the service life. The remaining life (remaining power storage capacity) of the battery close to the service life can be calculated according to the time point T1 when the battery voltage drops off the cliff when it is new and the time point T2 when the battery voltage drops when it is close to the service life.

In an embodiment, in steps S101 and S102, the voltage change rates of the new battery and the current battery at various time points may be obtained by a slope calculation method, or a derivative calculation method.

Specifically, two calculation methods can be used for the voltage change rate of the battery at each time point, a slope calculation method and a derivative calculation method.

Among them, the formula used in the slope calculation method is as follows:

k _n =abs((y _n+1 -y _n )/(t _n+1 -t _n ))

In the formula, k _n represents the voltage change rate of the battery at the time point t _n , abs represents the absolute value, t represents the time, and y represents the battery voltage.

The formula used to calculate the derivative is as follows:

In the formula, f(t)' represents the voltage change rate of the battery at the time point t _n , t represents the time, and y represents the battery voltage.

In the embodiment of the present disclosure, which calculation method is used to calculate the rate of change of the battery voltage can be selected according to the actual detection accuracy requirements. It is suitable for industrial or military use scenarios that require high real-time performance and high computing accuracy. Through the above two calculation methods, when it is calculated that the voltage change rate at a certain time point is greater than the preset first threshold, the time point is the time point when the battery voltage falls off the cliff.

In one embodiment, the method further includes the following steps S104 and S105.

S104. Obtain the remaining power storage capacity of the battery in different periods;

S105. Draw a change curve of battery power storage capacity according to the remaining power storage capacity of the battery in different time periods.

In the embodiment of the present disclosure, the change curve of the battery power storage capacity can be displayed to the user, so that the user can grasp the change of the remaining life of the battery in real time.

The battery life detection method provided by the embodiments of the present disclosure does not directly depend on the value of the battery voltage, but uses the “battery voltage cliff drop time point” detection method in order to achieve the purpose of actually low-cost and operable battery life detection. , according to the different time points of the same battery at the initial stage of its use and the current voltage cliff drop, by comparing the time points of the battery voltage cliff drop in different use periods, the remaining battery life (battery remaining power storage capacity) can be obtained, and then it can be judged whether the battery has reach its service life.

FIG. 3 is a schematic flowchart of a battery replacement reminder method according to an embodiment of the present disclosure. As shown in FIG. 3 , the method includes the following steps S201 to S203.

S201. Using the battery life detection method described in the previous embodiment to obtain the current battery remaining power storage capacity (for details, please refer to the previous embodiment, which will not be repeated here);

S202. Determine whether the current remaining power storage capacity of the battery is less than the preset second threshold, if so, execute step S203, if not, return to step S201;

S203. Prompt the user to replace the battery.

In the embodiment of the present disclosure, in step S202, if it is determined that the current remaining power storage capacity of the battery is not less than the second threshold, the process returns to step S201 to continue to detect the current remaining power storage capacity of the battery until it is determined in step S202 that the current remaining power storage capacity of the battery is less than the second threshold When the threshold value is 2, step S203 is performed, and the user is prompted to replace the battery. The second threshold can be set by those skilled in the art according to the actual battery model.

The battery replacement reminder method provided by the embodiments of the present disclosure can not only detect the remaining life of the current battery as safely, accurately, and at a low cost as possible without affecting the normal mobile phone function and power consumption, but also provide the user with a battery replacement reminder Serve.

FIG. 4 is a structural block diagram of a battery life detection apparatus provided by an embodiment of the present disclosure. As shown in FIG. 4 , the battery life detection device 4 includes a first acquisition module 41 , a second acquisition module 42 and a detection module 43 .

Among them, the first acquisition module 41 is used to acquire the voltage cliff drop time point of the new battery when it leaves the factory; the second acquisition module 42 is used to obtain the voltage cliff drop time point of the current battery; The time point when the voltage cliff drops is obtained to obtain the current remaining power storage capacity of the battery.

In the embodiment of the present disclosure, considering that the voltage cliff drop time points of the same battery are different in different use periods, the change of the battery service life can be obtained by comparing the voltage cliff drop time points of the new battery and the current battery. The current battery's remaining power storage capacity can be detected objectively and accurately without discharging the battery. It is more practical and suitable for users to test the battery life on a daily basis.

In one embodiment, the detection module 43 uses the following formula to obtain the current remaining power storage capacity of the battery:

Z=Tn/T1

Among them, Z represents the remaining power storage capacity of the current battery, T1 represents the voltage cliff drop time point of the new battery, and Tn represents the current battery voltage cliff drop time point.

In one embodiment, the first obtaining module 41 includes a first obtaining unit, a first determining unit and a first searching unit.

Wherein, the first obtaining unit is used to obtain the voltage change curve of the newly-produced battery during use; the first determination unit is used to obtain the voltage change rate of the newly-produced battery at each time point according to the voltage change curve of the newly-produced battery during use; The first search unit is configured to find a time point corresponding to a voltage change rate greater than a preset first threshold from the voltage change rates of the newly-produced battery at various time points, and use the time point as the time point for the voltage cliff drop of the newly-produced battery.

In one embodiment, the second obtaining module 42 includes a second obtaining unit, a second determining unit and a second searching unit.

Wherein, the second obtaining unit is used to obtain the voltage change curve during the current battery use process; the second determination unit is used to obtain the voltage change rate at each time point of the current battery according to the voltage change curve during the current battery use process; the second search The unit is configured to find a time point corresponding to a voltage change rate greater than a preset first threshold value from the voltage change rate of the current battery at each time point, and use the time point as the current battery voltage cliff drop time point.

In the embodiment of the present disclosure, the battery voltage variation curve can be obtained by a voltage sensor installed inside the mobile phone.

In an embodiment, the first determination unit specifically adopts a slope calculation method or a derivative calculation method to obtain the voltage change rate of the newly-produced battery at each time point; the second determination unit specifically adopts a slope calculation method or a derivative calculation method. The voltage change rate at each time point of the current battery is obtained.

In the embodiment of the present disclosure, which calculation method is used to calculate the rate of change of the battery voltage can be selected according to the actual detection accuracy requirements. It is suitable for industrial or military use scenarios that require high real-time performance and high computing accuracy.

In one embodiment, the battery life detection device further includes: a third acquisition module and a curve drawing module.

Wherein, the third obtaining module is used to obtain the remaining battery power storage capacity of the battery in different time periods; the curve drawing module is used to draw the change curve of the battery power storage capacity according to the remaining battery power storage capacity of the battery in different time periods.

The battery life detection device provided by the embodiments of the present disclosure does not directly depend on the value of the battery voltage to achieve the purpose of actually low-cost and operable battery life detection, but detects the "time point of the battery voltage cliff drop" , according to the different time points of the same battery at the initial stage of its use and the current voltage cliff drop, by comparing the time points of the battery voltage cliff drop in different use periods, the remaining battery life (battery remaining power storage capacity) can be obtained, and then it can be judged whether the battery has reach its service life.

FIG. 5 is a structural block diagram of a battery replacement reminder device according to an embodiment of the present disclosure. As shown in FIG. 5 , the battery replacement reminder device 5 includes the battery life detection device 4 and the reminder module 51 described in the previous embodiment.

Among them, the battery life detection device 4 is used to obtain the current remaining power storage capacity of the battery (see the previous embodiment for details, which will not be repeated here); the reminding module 51 is used to determine whether the current remaining power storage capacity of the battery is less than the preset first power storage capacity. Second threshold, if yes, prompt the user to replace the battery. The second threshold can be set by those skilled in the art according to the actual battery model.

The battery replacement reminder device provided by the embodiments of the present disclosure can not only detect the remaining life of the current battery as safely, accurately, and at a low cost as possible without affecting the normal mobile phone function and power consumption, but also provide the user with a battery replacement reminder Serve.

To sum up, the battery life detection method and device, and the battery replacement reminder method and device provided by the embodiments of the present disclosure can calculate mathematically by acquiring data such as the battery voltage change curve, the battery voltage change rate, and the battery voltage cliff drop time point. The method can objectively and accurately detect the battery life, and can remind the user to replace the battery in time.

Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, functional modules/units in the systems, and devices can be implemented as software, firmware, hardware, and appropriate combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be composed of several physical components Components execute cooperatively. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media).

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present disclosure. scope.

Claims (8)

1. A method for detecting battery life, comprising:

obtaining the descending time point of the voltage cliff of the battery when the battery leaves a factory newly;

obtaining the descending time point of the cliff of the voltage of the current battery; and (c) a second step of,

obtaining the residual electricity storage capacity of the current battery based on the time when the battery leaves a factory and the voltage of the current battery falls off the cliff;

the voltage cliff drop time point of the battery is the time point when the output voltage of the battery is suddenly dropped before the electric quantity of the battery is about to be used up;

the remaining power storage capacity of the current battery is obtained based on the new delivery time and the voltage cliff descending time point of the current battery, and is obtained by adopting the following formula:

Z＝Tn/T1

wherein Z represents the remaining power storage capacity of the current battery, T1 represents the voltage cliff drop time point of the battery when the battery is newly shipped, and Tn represents the voltage cliff drop time point of the current battery.

2. The method of claim 1, wherein acquiring a drop time point of a battery voltage across a cliff for a factory new battery or a current battery comprises:

acquiring a voltage change curve of the battery in the using process;

obtaining the voltage change rate of each time point of the battery according to the voltage change curve in the use process of the battery; and (c) a second step of,

and finding out a time point corresponding to the voltage change rate larger than a preset first threshold value from the voltage change rates of the battery at all time points, and taking the time point as a battery voltage cliff descending time point.

3. The method according to claim 2, wherein the voltage change rate of the battery at each time point is calculated in a slope manner or a derivative manner.

4. A battery replacement reminding method is characterized by comprising the following steps:

obtaining the current remaining storage capacity of the battery by using the battery life detection method according to any one of claims 1-3; and (c) a second step of,

and judging whether the current residual power storage capacity of the battery is smaller than a preset second threshold value, if so, prompting a user to replace the battery.

5. A battery life detection apparatus, comprising:

the first acquisition module is used for acquiring the cliff voltage drop time point of the battery when the battery is newly delivered from a factory;

the second acquisition module is used for acquiring the voltage cliff descending time point of the current battery; and (c) a second step of,

the detection module is used for obtaining the residual electricity storage capacity of the current battery based on the time point of the voltage drop of the current battery when the battery leaves a factory and the current battery;

the cliff voltage drop time point of the battery refers to the time point when the output voltage of the battery drops sharply before the electricity quantity of the battery is about to be used up;

the detection module obtains the current remaining power storage capacity of the battery by adopting the following formula:

Z＝Tn/T1

wherein Z represents the remaining power storage capacity of the current battery, T1 represents the voltage cliff drop time point of the battery when the battery is newly shipped, and Tn represents the voltage cliff drop time point of the current battery.

6. The apparatus of claim 5, wherein the first obtaining module comprises:

the first acquiring unit is used for acquiring a voltage change curve of a battery which is newly delivered from a factory in the using process;

the first determining unit is used for obtaining the voltage change rate of each time point of the factory-new battery according to the voltage change curve of the factory-new battery in the using process; and the number of the first and second groups,

the first searching unit is used for finding out a time point corresponding to a voltage change rate larger than a preset first threshold value from voltage change rates of all time points of a newly-shipped battery, and taking the time point as a voltage cliff descending time point of the newly-shipped battery;

the second acquisition module comprises:

the second acquisition unit is used for acquiring a voltage change curve in the current battery use process;

the second determining unit is used for obtaining the voltage change rate of each time point of the current battery according to the voltage change curve of the current battery in the using process; and the number of the first and second groups,

and the second searching unit is used for finding out a time point corresponding to the voltage change rate larger than a preset first threshold value from the voltage change rates of the current battery at various time points, and taking the time point as the descending time point of the current battery voltage cliff.

7. The apparatus according to claim 6, wherein the first determining unit obtains a voltage change rate of each time point of a battery newly leaving a factory by specifically using a slope calculation manner or a derivative calculation manner; the second determining unit specifically obtains a voltage change rate of each current time point of the battery by adopting a slope type calculation mode or a derivative type calculation mode.

8. A battery replacement reminder device, comprising:

the battery life detection device of any one of claims 5-7, configured to derive a current battery remaining storage capacity; and (c) a second step of,

and the reminding module is used for judging whether the current battery residual power storage capacity is smaller than a preset second threshold value or not, and if so, prompting a user to replace the battery.

Images