17 Oct Lithium battery unit meaning and conversion
When we buy products such as diving lights or lithium batteries, we will definitely compare the battery capacity. We will see Ah, mAh, Wh and other unit data marked on the battery or canister light. Do you know what they mean? Today I will introduce the lithium battery capacity unit so that everyone can have a better understanding of lithium battery related products.
Common battery capacity units are introduced as follows:
(1) Ah ampere-hour: One of the important units of battery performance is battery capacity, which is usually measured in Ah ampere-hour. For example, a 7Ah battery has a battery life of 0.35A when the continuous discharge current (power consumption) is 0.35A. Reach 20 hours (calculation formula is: 7Ah/0.35A=20h).
(2) mAh milliampere hour: It is one thousandth of Ah ampere hour. The power of 1mAh is the power of 1mA current for 1 hour. Assuming a 2000mAh 18650 battery, it is equivalent to having 2Ah of power.
(3) Wh Watt hour: mAh is the unit of battery capacity, and Wh is the unit of battery energy. If you want to convert mAh to Wh, you also need to know the voltage to calculate it. The conversion formula between the two is Wh= V(voltage)*mAh/1000.
For example, the capacity of one 18650 is 3500mah, and the standard voltage of the battery is 3.7v. If three 18650 batteries are connected in series, it will be 11.1V. So how much energy do three 18650 batteries connected in series have? Calculated according to the formula, 11.1*3500/1000=38.85WH.
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