I have A Del tran battery tender Junior. The light on it is continually red At this point. The batteries been plugged in for a few days and the greatest charge I can get from it is 11.8 V. The charger is eventually supposed to stop being a solid red and turned to green but he hasn't done that. How do i test to make sure my battery is okay? I've only had the battery for one season I used it on my trolling motor last year and kept it on the battery tender all winter.
Thanks for your help