No I cannot state SOC but most cells(16) are currently at 3.2 - 3.5v. One bank of 4 is at 2.83v. Slowly getting familiar with this technology. I'm trying to understand how to charge and discharge these cells so I can determine their over all health and see if I can salvage the battery.
I just ordered some parts and testers to start delving into this. I don't have any thing to start trouble shooting these cells but I've opened up the case and removed all the cells.
I had an mp3 player that had an early form of lithium battery and the battery slowly swelled and eventually puffed out the mps player and broke it apart but it still worked just fine. https://www.dfrsolutions.com/blog/why-do-lithium-ion-batteries-swell
Thanks for the article. Interesting but not conclusive. Will be interesting how the numbers look once I start testing them. Because the BMS failed in that battery, over discharge/charging seem likely. All 4 in one bank are swollen.
From my understanding, nominal v of LIPO would be more around 3.7v whereas LiFePO4 is 3.2v??
My second battery has issues as well so it's possible something damaged the BMS on both. Not sure yet. If it's damaged as well I guess I have a lot more learning to do then I had planned as I will have to look at my charge controller as well then
Nominal sure that's the paper spec, but actual comes down to the state of charge and specific chemistry. So if you look at a cell with 3.2v on it, without any other information, all you can say is that the voltage across the terminals is 3.2v.
That lends weight to it really being a lifepo4.
~~ I am also not stranger to having trouble establishing a dialouge, getting answers to my questions and getting spec sheets with pacific rim manufactured solar equipment and batteries. It helps if the equipment can be purchased from a reputable provider who has an established location on the North American continent with technically savvy salespeople who can find answers to your technical questions. For what its worth, im pretty sure that Topband knows their stuff and knows how to build their products and they have been around about twenty years. The following link contains some different ways to communicate with them, (including live chat), not sure if they have good translators on staff give it a try? Good luck, be patient, have your model and serial numbers and purchase information available and keep your language and questions simple.
I did buy these batteries from a US company who later ran into what seems was a major dispute between owners, shady dealings and financial issues. The company exists under a different name and brand now with the one owner. Looking at the whole situation now, something is very wrong about my purchase and without a lawyer, seems I will get no where. I thought I was dealing with a reputable company at the time. No red flags when I researched them. Nothing but good reviews then all went to hell. I will try your link and see what happens. Thanks.
