I recently had to buy a new battery charger caused i noticed my batteries never goy fully charged. at first it thought they were no good , there old and its time to replace them. so i borrowed a battery charger fro a freind and they both fully charged??? din,ding , i need a new charger. run off to sears and there out but can get one in four days , i had planned a trip with my cousin so i needed one right away. ran to walmart and they only had one that was a charger, the rest were jump starters. its made by shewmaker and its called the speed charger. they have three or four different maodels and this thing actually charged both batteries within 24 hours. fully charged at that. it has several settings on it one is for deep cycle batteries. shows how many volts you have and the % of charge. small and compact could probably be mounted some way in the boat and wired to the batteries if you modified it a little. but was indeed impressed with this product. best charger i have owned and priced at $50 bucks. works better than 150 dollar chargers i have bough and used. just thought i would pass this on incase any one was intrested or in need of a new charrger.