Question: how to calculate watt hours of lithium battery?
Answer: example 1: an 11.1 volt 4,400 mAh battery – first divide the mAh rating by 1,000 to get the Ah rating – 4,400/1,000 – 4.4ah. You can now calculate as – 4.4Ah x 11.1 volts = 48.8Wh.
example 2: a 12 volt 50 Ah battery – 50 Ah x 12 volts = 600Wh.