It normally only takes a few hours, but now I can leave my onboard charger plugged in all day and it will never stop charging. It actually may stop, but the fully charged light never comes on. I know it's charging because the battery was totally discharged, and after charging I was able to fish for several hours without the battery dying. Is this a sign of a problem with my charger, or is it more likely an indication of a worn out battery? I'm going to hook up my portable charger to see if it fully charges the battery, but I was just wondering if anyone had dealt with this before.

Are you getting full power out of your battery when you use it?