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Nowadays, most mobile devices and cameras use lithium battery packs, and most consumers do not understand the capacity markings on these battery labels, such as mAh and Wh representing nothing. Actually, learning to understand these signs is very simple and practical.

In fact, if these two batteries are both mobile phone batteries, their capacity can still be compared in mAh. But if they are not the same type of product, comparing them directly may be wrong. Aren't they all lithium batteries? Isn't it all the same? Why can't we compare? Although they are both lithium batteries, the voltage of these two batteries is actually different, which is due to the voltage. Therefore, simply comparing the magnitude of the mAh number is not comparable.

Simply put, the physical meaning of battery capacity refers to how much charge a battery can hold or release, and we often use Ah (ampere hour) or mAh (milliampere hour) to represent it.

According to the definition formula of current: I=Q/t, it can be seen that Q=It. The unit of current I is mA (milliampere), and t represents time in hours. Therefore, our battery capacity unit is mAh.

That is to say, if a battery capacity represents 1000mAh, and its operating current is 100mA, theoretically it can provide power for 10 hours of use.

However, from the formula, we can see that Q=It does not involve voltage, so this unit can only indicate how much Coulomb of charge can be accommodated inside the battery. But it cannot be stated how much work this battery can do, or what is the maximum power that the battery can provide. The working voltage of different types of products varies. Therefore, we often see a number in Wh next to mAh. The work that a battery can do is W=UIt=UQ, and the unit of voltage U * current I is W (watts). Therefore, W in a battery is expressed in Wh, which represents how much work the battery can do.

Wh is a quantity that is directly proportional to voltage, current, and time. And mAh is usually used as an indicator for battery charging and discharging, which is directly proportional to the charging (discharging) current and time of the battery. To make it comparable or convertible to Wh, it is also necessary to know the voltage of the battery. Simply put, Wh=mAh/1000 * voltage.

And the voltage of the 6600mAh battery mentioned earlier is 14.4V, 14.4 * 6600=95.04Wh, so all the work it can release is 6.6 * 14.4 * 3600=342144 joules of work.

The voltage of a typical mobile phone is 3.7, so the theoretical work that the 5200mAh mobile power supply can do is 3.7 * 5200=19.24WH, and 3.7 * 5.2 * 3600=69264 joules of work.

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