Thank you kindly for your informative reply There's a bit more to this which appears in a post which seems to have been lost. I only need a few hours runtime two or three times a year, if that. This will be used by the elderly widow of a sculptor to move around some of her husband's very heavy art materials. She used to drive a forklift, so no problem there. About the charger, this was a lead acid system from 1984 which I think nthey acquired in the mid 90's. So, would the best battery choice for me be lead acid deep cycle solar batteries? She certainly cannot afford AGM. I still am not sure if the solar batteries at 55ah would be more compatible with the charger than the 100ah EFB batteries which also claim to be forklift friendly in their literature. What do you think? Solar @55Ah for 220Ah@24v or EFB @100Ah for 24v@400?