Phone battery power

摘要

All batteries have a power rating, measured in milliamp hours (mAh). If s a useful specification for comparing phone batteries. However, it won't necessarily tell you how long a battery will last in any given device, because each device requires a specific amount of power, depending on factors like their processor's speed and screen's resolution. You can't therefore assume that a battery with a high mAh will last longer than one with less.