Battery Wh Calculator
Comparing different voltages is almost like comparing the engines of two cars: a 1.6 litre car is likely to be more powerful than a 1.2 litre. And it’s the same with batteries - the higher the voltage, the higher the power and performance.
In terms of amp hours (usually the smaller number on the battery e.g. 2.6Ah, 5.2Ah or 8.0Ah), think of this as the size of your fuel tank. The more fuel you can store, the more miles you can do with a full tank. Or in construction terms, the more holes you can drill or cuts you can make.
So, you’d think comparing those numbers like for like would enable you to compare the performance of different batteries on the market. Unfortunately, it’s not always that simple - but there's a quick and easy calculation you can do to better compare different batteries. As mentioned, the universal way to independently compare battery performance is to multiply the voltage by the amp hours, which gives you the total capacity of the battery. Often this value is written on the label of the battery and named Wh (Watts per Hour). For example: