Keep in mind that batteries tend to be in the range of a few hundred watt hours. Residential electricity is billed in kilowatt hours, at a range straddling 10 cents per kwh, so a full charge might cost about a nickle where electricity is fairly pricey.
I suspect that wear and tear on the battery, and ultimate replacement will be a bigger expense than the juice consumed.
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Last edited by FBinNY; 12-15-16 at 07:06 AM.