This Canadian Dollar and United States Dollar convertor is up to date with exchange rates from October 15, 2015. Enter the amount to be converted in the box to the left of Canadian Dollar.
1.2V per NiMH and NiCad cell. 2.1V per lead-acid cell (car batteries are 6-cell (12.6V) and some golf carts are 3-cell (6.3V)) Finally, multiply the voltage (V) by the amp-hour (Ah) rating of the battery/pack to get watt-hours (Wh) and then compare. For example, the Switch 8 Solar Recharger is 3.6V and 2.2Ah (2200 mAh) By multiplying those two together you get 7.92W.
E = P * t. Ideally, the capacity of a battery would also be measured in watt-hours. So if you have a 1.2 volt 2000 mAh NiMH battery, then it holds 1.2*2000 = 2400 milliwatt-hours of energy. A similar size li-ion battery might be rated at only 750 mAh, but the voltage on that battery is 3.7 volts.