How long is the battery life of the Apple phone? How to calculate iphone battery life

How long is the battery life of the Apple phone

First, battery life:

According to official parameters, in IPhone5, for example, full charge (20% charge to 100%) 400 times after the battery performance will be reduced by 80%, each year with 20% performance decline.

The iphone battery life theory time is about 2-3 years.

Second, standby time:

If a smartphone battery capacity of 1500MAH, standby current standard between 2.5MA~3MA, the normal network environment to use, standby time can be calculated by the following way.

Because the battery to achieve a certain voltage, to maintain a mobile phone boot, so the phone in the low power automatic shutdown, there is still residual electricity, generally around 10%, in the calculation to subtract 10% of the electricity.

1500MAH (1-10%) ÷3ma~1500mah (1-10%) ÷2.5ma=450h~540h

That is, the standby time is about 450-540 hours.

Mobile phone in the actual use of the process, it is not possible to be in the ideal standby state, open WiFi, Bluetooth or GPS for standby, occasionally light the screen to see the time, to view short messages, phone calls, listening to music, watching movies, playing games, background running programs, Internet and other operations are very common, these operations are very large power consumption, Will quickly shorten cell phone use time. Increase the power consumption of mobile phones, shorten the use time.

Smartphone usage Time calculation method:

Example 1 if a smartphone battery capacity of 1500MAH, Internet average current of 400MA, can calculate how long the Internet time: 1500MAH (1-10%) ÷400ma =1350mah÷400ma =3.4h

Example 2 if a smartphone battery capacity of 1500MAH, the use of 2G network call current for 250MA, you can calculate how long consecutive calls: 1500MAH (1-10%) ÷250ma =1350mah÷250ma =5.4h

Third, charging time:

Using a constant current constant voltage charger with a rated voltage of 4.2V, the lithium-ion battery can be filled with electricity within an hour of 1.5--2.5.

How to calculate the iphone battery age?

　　How to calculate the age of the iphone battery?

According to the 3-year period, three years after the battery capacity of 100% of 65%. Total days in three years 1195 days (500*94%=470, 500*80%=400, 500*65%=325;)

The average human age is 80 years old

"Battery remaining Life" -1195*80% is the age of your battery!

For example: 830-1195*80%=29 years old

Where's yours?

How did you get here 500 times?

Lithium-ion batteries can only charge 500 times?

Believe that most consumers have heard, lithium battery life is "500", 500 charge and discharge, more than this number of times, the battery is "dead", many friends in order to be able to extend the battery life, each time the battery is completely depleted before charging, so that the battery life really has extended effect? The answer is in the negative. Lithium battery life is "500 times", refers to not the number of charges, but a charge and discharge cycle.

A charging cycle means that all of the battery's electricity is filled with empty, and then empty, which is not equivalent to recharging the electricity. For example, a lithium-ion battery uses half of its electricity on the first day and then fills it with electricity. If that's the next day, that's half the charge, a total of two charges, which can only count as a charge cycle, not two. Therefore, it is usually possible to charge several times before completing a cycle. Each time a charge cycle is completed, the battery capacity is reduced by a little. However, this reduction is very small, high-quality battery after many cycles, still retain the original capacity of 80%, a lot of lithium power products after two or three years are still used as usual. Of course, lithium battery life is still to be replaced after the final.

And the so-called 500 times, refers to the manufacturer at a constant discharge depth (such as 80%) to achieve 625 times the number of rechargeable, reached 500 charge cycle.

(80%*625=500) (Ignoring the lithium battery capacity reduction and other factors)

And due to the various effects of real life, especially when the discharge depth is not constant, so "500 charge cycle" can only be used as reference battery life.

　　Life and influence factors

Lithium batteries can be recharged 300-500 times. It is best to partially discharge the lithium battery, rather than to discharge it completely, and to avoid frequent and complete discharges as much as possible. Once the battery is down the line, the clock starts to move around. Whether you use it or not, the life of lithium batteries is only in the first few years. The decrease in battery capacity is due to an increase in the internal resistance caused by oxidation (which is the main cause of the decrease in battery capacity). Finally, the electrolytic cell resistance will reach a point, although the battery is full of electricity, but the battery can not release the stored electricity.

The aging speed of lithium batteries is determined by the temperature and charge status, and the following table illustrates the reduction of battery capacity under two parameters:

1 years later volume 94%

2 years later volume 80%

3 years later volume 65%