I bought this for my tin boat. Product Page
If the link doesn't work, it is the diehard platinum 6/12 volt battery maintainer. Got it for $ 25 on sale. I think it is on sale now for $29.99. It works like an onboard charger that goes into maintenance mode when the battery is charged. I only have one battery on the tin boat so it fits my needs well. It is small, inexpensive, and portable. I also use it for the lawnmower battery.
Triton 190FS, 200hp Optimax, HB 798C HD & War Eagle 548LDV, HiTek, 30hp Mercury, HB 998C HD
Fishing is a privilege...catching is a bonus. Enjoy each precious moment we have to experience our great outdoors!