Topping up leisure batteries from the motor

I think we have to look at the economics. A new Honda 15 is about £3000. How much will some extra use devalue it compared to new batteries, solar etc. It’s quite possible that using the motor to keep some old batteries going is the cheapest way
 
Old batteries are not good batteries
Better replace
PS that company have a more expensive range but if they last two or three years at that price it’s worth a go
 
I have bought several batteries from Advanced Battery Supplies over the years for three cars and a boat. I am a satisfied customer and would buy from them again.
 
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