There is no problem connecting a maintainer to the chassis battery with the cables connected but there may be a problem with leaving a maintainer on the battery unattended for long periods. There have been more than a few reports of the maintainers malfunctioning and overcharging or damaging the battery. I bought one of the weekly mechanical lamp timers and plug the maintainer into it, I have it set to come on for 4 hours every Friday but you could set it for a couple hours every day. That way if something goes wrong it wont be on long enough to do any damage but still keeps the battery topped off.
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