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6v golf cart batteries are one of the most popular home built electric vehicle battery, they are also the most popular for factory built electric cars that use lead acid, a T105 golf cart battery weighs around 67 pounds each, my car takes 8 of them, alot of the trucks that are out there have 20 or so of them, takes me about 2 hours to swap batteries on my electric car, if I had quick connect plugs I'm sure I could cut that down to an hour or less.
To make this idea practical you would want a battery monitor that monitors each battery in the pack, something that would log voltage drop and charge and time spent discharged, basically all the things that shorten battery life, every time you swap a battery download and reset the stored info.
You can also get pretty accurate battery testers that will test a charged or discharged battery that work like a load tester but much more accurate.
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