Lez_go
New Member
I have three 206AH SOK batteries wired in series. I haven't been working on my build, so I turned the power system off as it started to get cold. I wasn't charging, batteries were at about 13.2 V when I turned everything off as it was too cold to charge. They sat for about a month, temps in MI got very cold, below zero a few days. I decided to remove the batteries, but wanted to charge them fully before I did so.
Had a warm day and turned heat on in the van and got the inside temp up to 68° F. As soon as I turned the charger on, something was off. The battery monitor was jumping voltages all over. I turned it off. Disconnected the batteries and brought them inside. Tried to charge them individually, and now none of them will charge above 13.54V. They work, before I removed them. They were powering lights just fine. Just won't charge.
What do I need to do to diagnose the issue? Should I disconnect the BMS and individual cells and try to charge them individually to see if any of the cells are damaged?
Had a warm day and turned heat on in the van and got the inside temp up to 68° F. As soon as I turned the charger on, something was off. The battery monitor was jumping voltages all over. I turned it off. Disconnected the batteries and brought them inside. Tried to charge them individually, and now none of them will charge above 13.54V. They work, before I removed them. They were powering lights just fine. Just won't charge.
What do I need to do to diagnose the issue? Should I disconnect the BMS and individual cells and try to charge them individually to see if any of the cells are damaged?