Details: How to determine the remaining capacity of the battery cell phone?

First of all the provisions of the definition of battery capacity: a fully charged battery in accordance with the provisions of the constant current discharge, when the discharge voltage to the provisions of the time spent in current received by the capacity of the battery.

For instance, a lithium sony laptop battery from full charge (4.2V) in order to discharge to 2.75V at 600mA spent 65 minutes, the battery capacity of 600mA * (65/60) h = 650mAh.

A battery discharge when the presario nx9000 battery voltage as the battery drain gradually decline.

This can be a relatively simple and effective relationship is the voltage on the capacity. Received a hp f2299a of normal use (such as 50mA discharge) discharge curve, the time for sub-4 in order to limit the voltage of 4.2V rechargeable lithium battery for example, can be listed in such a relationship

4.20V---- 100%

3.95V---- 75%

3.85V---- 50%

3.73V---- 25%

3.50V---- 5% (cell phone can not be completely used up because the hp f3172a power, are generally lower than 3.50V may automatically shut down when a) 2.75V---- 0%

In many cell phone hidden inside the menu, could be released engineering model to see the hp f2019 voltage, such as Samsung mobile phone series, Bird S1200 and S1000, such as mobile phone, both can see the battery voltage. Of course, because the relationship between the above cell types and different manufacturers vary, but similar can be used to refer to.

With such a correlation between the consumption display on the mobile phone is relatively simple, and single-chip sampling of a hp f2019a voltage value, such as voltage of 3.90V, on the display 3 grid (4 cells for the full grid), and so on.

If you want to show the cell phone hp f2019b,hp f2024a precise capacity, must always conduct discharge current computing points of time, this process is relatively complex, requiring dedicated chip to complete a battery with a chip (costs go up), and notebook power of lithium batteries on the have such a management chip to accurately access the capacity of the battery, SONY smart lithium batteries are Ericsson T28 mobile phone, such as lithium batteries has a similar chip, as far as I know, Texas Instruments BQ26231 can achieve this function, so their user interface on the percentage of battery capacity has shown that more comfortable. Otherwise we can only look rough electricity "grid" the.

Waveguide certain models (such as 936, S1200, 8288, including the previous old fighter 818,838) show the capacity of another somewhat unconventional, S1200 as an example in his capacity lattice defined as follows: 4.20V ~ 3.76V---- 4 Grid 3.76V ~ 3.72V---- 3 Grid 3.72V ~ 3.70V---- 2 Grid 3.70V ~ 3.60V---- 1 Grid 3.60V below ------ 0 grid, omnibook 6000 battery,hp f2024b alarm About 3.40V to shutdown Contrast the normal capacity of relations, it shows that when the remaining 3 cell is 3.76V, the actual hp f1739a,omnibook xe battery only about 30% of electricity consumption, and this may explain why the S1200 mobile phone (cell phone mentioned above is true )

The first cell can be used for a long time, and the next 3 grid instead of the end of one day.