I'm partial to using a few batteries as possible, so mine is a 12v. I think continuous trickle charge mixed with never bringing the battery below 50% capacity, preferably not down below 70% helps a lead acid battery. My solar 'array' of 2 5 watt panels stopped working last year, due to wire damage, so I hope to get a 15 watt replacement up and running again soon to get the free charge and trickle again. It helps to lubricate the motor bearings, keep the wheels set very high and sharpen the blade frequently in addition to the obvious things like not mowing wet or waiting until the grass is very very high to mow.
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