Name: 20190506_164702.jpg Views: 356 Size: 94.8 KBName: 20190506_164716.jpg Views: 351 Size: 82.5 KBName: 20190506_164822.jpg Views: 389 Size: 72.2 KBName: 20190506_164850.jpg Views: 388 Size: 77.1 KBName: 20190506_164911.jpg Views: 325 Size: 61.6 KBWell I went the cheep and easy to replace way. I got these Charger/Maintainer at Lowes or Home Depot. $20.00 each. I got one for each battery in my boat along with one for lawnmower, 2 4 wheelers and the tractor, anyway, I can fish all day and plug them at the dock or motel, normally the battery is charged by daylight. They don't weigh anything, three ways to quick connect and disconnect. Small and lite enough to mount in the boat almost anywhere, they stay cool. When I'm not fishing there always maintaining my batteries. I have been using these since 2015. Great Product.