How can you find out how much battery capacity is left in your phone?

Using a mobile phone people tend to only see battery showed a few or percentage than this class, it's hard to judge the real power, you are below give a more standard power data.

Steps/methods

A, first of all, the definition of battery capacity: a piece of batteries in accordance with the relevant provisions of constant current charge discharge current, when the discharge to the specified voltage to get the time to take in the current capacity of the battery.

For example, a piece lithium battery from the charge (4.2 V) at 600 ma took 65 minutes for discharge to 2.75 V, the battery capacity is 600 ma * h = 650 mAh (65/60).

How to judge of mobile phone battery remaining capacity

A battery at the time of discharge, battery voltage will be reduced gradually as the loss of battery.So you can get a more simple and effective, the corresponding relationship is the voltage on the capacity.

Get a battery normal use (for example, 50 ma discharge) discharge curve, to quartiles of time, with a charge to limit the voltage of 4.2 V lithium battery for example, can list a corresponding relation

4.20V----100%

3.95V----75%

3.85V----50%

3.73V----25%

3.50 V - 5% (because the cell phone can't completely use photovoltaic power, usually less than 3.50 V can automatically shut down)

2.75V----0%

Second, in many mobile phones hidden menu, can bring up the engineering mode to view the voltage of the battery.Of course more than corresponding relation for the battery type and different manufacturers, but similar, can be used for reference.With such a corresponding relationship, mobile phone battery display is relatively simple, single chip microcomputer sampling a battery voltage value, such as voltage of 3.90 V, it shows 3 (full), 4, so on.

Three, mobile phones, if you want to display the battery accurate capacity, must always be on discharge current for the integral operation of time, the process is complicated, need dedicated chip to complete, a battery with a single chip (cost will go up), notebook power lithium batteries have such management chip to the capacity of the battery are obtained, smart cell phone lithium batteries such as lithium-ion batteries have similar chips, as far as I know, Texas instruments BQ26231 can realize this function, so they have the percentage of the battery capacity, according to the user interface is comfortable.Otherwise we can only see a rough power "grid".

Some models (such as 936, S1200, 8288, including 818838 old fighter) capacity show a little off-beat, S1200, for example, he has a capacity of grid are defined as follows:

4.20 V ~ 3.76 V - 4

3.76 V ~ 3.72 V - 3

3.72 V ~ 3.70 V - 2

3.70 V ~ 3.60 V - 1

Below 3.60 V -- -- -- -- -- - 0, battery alarm

About 3.40 V to turn it off on its own

Compared to the normal capacity, it is to display the remaining 3, is 3.76 V, only about 30% of the actual battery power, this could explain why S1200 mobile phones (cell phones are so mentioned above) the first case can be used for a long time, and it follows that the 3 g instead of 1 day.

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