Battery Minders

I agree with ScottG and ClayL. I have used both the "minder" and "tender" and both have worked well. Minder 1500 is temperature compensating. Northern tool usually has a good price and free shipping. I have three running right now..boat, trailer and TV.

I have used the BatteryMinder on my motor home for many years. Also to keep 4 equipment batteries up all winter at a commercial peach orchard in CO.See HERE

I have a Schumacher and a couple of Sears Diehard maintainers. Neither will over charge your battery. Just make sure you get a 'maintainer' not just a charger.

The original Battery Tender has served me well and has true multi-stage charging. It will not cook a battery like some cheap units do.
It's about $25.

I use a Schumacher 1.5 Amp charger from Walmart,it's automatic.about $ 20.
Siggy

I use a trik-l-start to maintain the chassis battery.