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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.

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 :)

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...

Sorry this is a bit long winded. I'll be upfront here. I am not a solar hobbyist or anything like that but I am a DIYer and I am looking for shortcuts here in maybe reviving my batteries. Background; I bought some lithium ion batteries (2x100Ah) for my RV 3yrs ago from a company in Florida...

The cells are TOPBAND 3.2v 80Wh. The number on the cell, 2770180 returns TB-027070180D-FE-25Ah, on one TOPBAND site. The 80Wh equates to 25Ah and they are both 3.2v. The difference is in the dimensions in that my cell is a little shorter. Other dimensions the same. With all the copying going on...

I think so. This forum seems like a real good resource if I need clarification or something.

Really appreciate the response. I'll try these settings and go from there. I find there is so much conflicting advice out there, sometimes its hard to know what to do. I kept hearing that using only 80% capacity was ideal so that is what I was attempting but I'm thinking I misunderstood after...

From my understanding, nominal v of LIPO would be more around 3.7v whereas LiFePO4 is 3.2v??

I have this small dc buck converter to charge some LiFePO4 cells and it is rated for 3A max. I also have a AC lithium charger rated at 14.5v 40A. Is there any way I can limit the current so it doesn't blow my buck converter or do I have to find a different charger?

My smart bms s/w on android is showing my battery at 100% charged while the voltage is at 13.4. A renogy battery monitor is reporting 84% which is more realistic. I guess I missed something during the initial BMS setup. How do I set it to report correct SOC? Battery is 4 x eve 280Ah cells...

Not sure if I am using this charger properly. I want to charge a 4S bank of 25Ah LIFEP04 using the IMAX B6 V2. Setting the charge "profile" for 4S LiFE only gives me a voltage of 13.2v. I want to charge the pack up to full capacity or just under (14v) I can't figure out how to get the voltage...

Thanks for responding. Odd that you can't manually indicate a full charge and be done with it. I will discharge them then. Thanks.

Well I tested the buck converter and the output v was significantly lower than than the input and I couldn't adjust the output as the sparse instructions implied. Sent it back and I will get a variable, regulated power supply instead. On to my next issue ...

I'm setting up a new charge controller and I would really appreciate some feedback on my settings. I have an overkill BMS and it is set for the max and min voltage settings for EVE 280AH cells. I am attempting to use the SCC to keep the battery between 20 and 90% capacity. I just don't feel...

I am new to battery technology and I am working on a problem I have with batteries I bought. I cannot find the specs for the cells used in these batteries. Would I be safe to assume that my cells are LiFePO4 based on the sole fact that they are a 3.2v cell? They are at least 3 years old if...

MorningStar documentation warns that if the BMS drops off charging connection while PV is producing voltage, it will damage the controller (TriStar MPPT specifically). They even go so far as to say that to remedy the situation with a relay to cut of PV from charger likely wouldn't happen fast...

I haven't dealt with them in a while but when I did they were fantastic. Very fast response. They even shipped me a new controller at one point because my problem was odd and they couldn't resolve it. Turned out it wasn't the controller and the problem was resolved because they stuck right with it.

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.

When measuring Ir, is there a standard/better SoC to do the measurement? I just want to test a bunch of 80Wh LiFePo4 cells and looking to determine/match the cells based on capacity and Ir. I'm assuming those two tests are sufficient. I have read that meters aren't the best way to determine Ir...

OK. Understand. I might just start charging and see what it does and hope that it does what you describe. Thanks for your response.

Thanks to all.

I already have the controller. Four years now. It doesn't have a lithium profile:( I agree with the points you make and not sure why it is designed that way. Irregardless of the battery type, that is not acceptable.

Not sure if it makes any difference (my lack of knowledge) but the cell has 3.2v stamped on it.

From what I have learned so far, some battery and BMS (cells too for that matter) spec sheets say whether they can be connected in serial or parallel or neither so I guess that is a real issue. Unfortunately I don't have that info and never will if TOPBAND won't open up a dialogue with me.

Appreciate your response. I think I am getting a handle on what needs to be done. I do have a DMM and after some reading, I bought a Tenergy 5 in 1 cell meter to get the IR as well as the other functions, YEECO adjustable buck converter/ammeter/voltmeter and a cheap loading device for...

I had previously ordered something to discharge 25Ah 1C cells/banks and eventually a 100Ah battery, but I didn't know how to use it and there was zero documentation. I scoured Youtube for instruction videos but nothing so I sent it back. I would prefer the process to be automated in that I can...

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.