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These batteries are old school wet cell lead acid type. The ones I am getting are 6 volt GC2s 225 amp/hr each. In series they will provide over double the usable current in the crappy 12v that comes with the unit. They are cheap, so I will be able to experience how well they meet my needs and can decide later to get a better designed, more modern battery (lithium or AGM type of lead acid) and more expensive set.