I have 3 kirklands in my boat. 1 to start the boat, 1 for accessories and 1 for the trolling motor. has been 5 years not. the one that starts teh boat (115 yamaha 4 stroke motor) has never ever been on a charger. the one for the accesories (radio, fishfinders, etc) gets charged like once a month during the fishing season. and the trollign motor (55lb minn kota motor) gets charged as before we go out a again, that battery has always held up all day, we have never been without power to the trolling motor. So, in short. I have nothign but good to say about Kirkland batteries. to me they are god sent, all three batteries were under liek $200 all in.