Waterproof Battery Tender 022-0157-1 Marine Battery Charger. If you haven't already, you should definitely read my article Boat Battery Chargers Features .
800 12V Battery Charger. Water Resistant Power Tender Plus 12V, 5 Amp. High Frequency On Board Battery Charger 12v for Emergency Vehicle Use
Find the correct Battery TenderÂ® charger for your needs.
So I'm thinking battery tender for the H2o18 Sport w/ 3.0 Merc.. . Its only $20 bucks I use one on my tractor, ATV, and one of my boat batteries.