yellowdart
New Member
- Joined
- Mar 17, 2020
- Messages
- 7
I have had a set of four U27-12XP that I have been using without issues for over two years. They are great batteries and have served me well. One of the four, though, seems to be in a weird bricked state. This particular battery was in the front of my RV in a battery box and I found it submerged (but not to the terminals) in water since I didn't realize that the box needed drainage holes drilled at the bottom of it. My bad. When I removed the battery, there was no light, no nothing, but 13 V across the terminals. I thought that was strange. So I removed it. Let it sit for a few weeks. Nothing changed. I let it sit for another few months as I wasn't using it at the time. Today, I checked the voltage across the terminals and it was down to 3 V. So I decided to see if I could charge it back up and weirdly enough, it just took a charge like it normally would. It took easily 60-70 Ah of charge over the better part of a day. I don't have a way of measuring the accumulated current or the energy, but my guess is that it was significant (20 Amps for four hours or maybe a little more), but not the total 138 Ah that it should take. There is still no light. I tried to connect through the Valence app and still nothing. Any thoughts on how one might wake this thing up or at least see if the BMS is still alive? Did the BMS basically get bricked with the contractors all in the closed state? Do I basically have cells connected with absolutely no control or protection?
