How many 12 a/c volt batteries are needed to run a DC refrigerator?

Answer A power meter or oltmeter can be purchased to connect to your refrigerator to determine the volts needed to operate it. Multiply this number by 12 and that will tell you the number of 12 volt batte... Read More »

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How many watt hours are in 12 volt batteries?

A fully-charged 12 volt battery has 1,200 watt hours. This means that the battery has enough power to run an appliance that consumes 12 watts (or 1 ampere) for 100 hours before it becomes fully dis... Read More »

Is there anywhere where I can get a 12-volt car plug to recharge 9-volt batteries?

Is it okay to connect a 3.7 volt li-ion (900mAh) and a 3.7 volt li-ion (1000mAh) batteries in parallel?

I don't recommend doing it. Before that, though, if you're trying to increase the mAh rating, then parallel connection of two identical voltages will do what you want. Voltages in series will add... Read More »

Can you use two 12-volt batteries wired in series with a 12-volt trolling motor?

No. Wiring in series stacks the voltage being delivered. Two 12-volt batteries in series deliver 24 volts, which causes permanent damage and a fire hazard in a 12-volt trolling motor. Wire the batt... Read More »