Using a 2 watt coleman battery maintainer to keep batteries alive when not in use.
Just for peace of mind, I’m trying to figure out if these coleman battery maintainers will keep my batteries alive through a Northern Ontario winter. I paired my 6V 215 AH batteries to make them 12V and attached a maintainer to each pair. The maintainers state they can deliver 15V @ 133 mAmps. Other than that, I can find no other info on them. Is it possible to make a good estimate of the viability of them keeping the batteries alive?