While controlling power to the electronics circuit on the board is crucial to have a longer battery life, it is also important that the battery should not be discharged deeper so that the longevity of the battery is increased. In our mobile phones, it is preferred that we don't wait until the battery is fully discharged. We have to charge before battery dies down. The depth of discharge is 80% for these batteries, which meant, when the battery is at 20%, it is better we charge them again.
For example, if we have a 4600 mAh battery and we use this battery for 30 minutes to provide 4600 mA power to a load, then the DOD is ((10*4.6)/60)/4.6 = 50%
In the above example, we can say battery is discharged 50% of it's value within 30 minutes with a full battery capacity is utilized for that entire 30 minutes.
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