LUND on-board charger

[Jigspoon]

I have a Lund on board charger for my 24v system. I charge the batteries to full and after a week one of the batteries is at 75% charged. Didn't think I needed to disconnect them after charging. Both batteries are new and nothing is connected to it except for the battery gauge on the bow.What do you guys think???

[seaotter]

I had the same problem. After replacing a new battery and the new battery showing discharge again, I switched the leads to the battery gauge and found that to be the problem. On my gauge battery # 2 was always lower on charge than #1 no matter which way they were hooked up.

[Jigspoon]

Thank-you Sea Otter !!!