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what you want to know is how much a watt hour of capasity is going to cost you, to figure that out multiply the volts times the amp hours, and you get watt hours, those batteries are about 3.96 watt hours, and could, in thoery give 3.96 watts for an hour, not a whole lot for $6 each, $1.51 per watt hour, and that is what you want to know for comparing batteries, the cost per watt hour.
for building an electric vehicle, I've thought about getting Lithuim iron batteries, like DeWalt uses in their 36 volt battery packs, because of their long cycle life.
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