Reviving a Dead Renogy Lithium LIFEPo4 Battery with Capacity Test.

Every have a lithium battery not want to take a charge, sometime sit just need a jump start.

[dmitrylitvinov]

I suffered with a Renogy Bluetooth 100 AH "smart" Li ion battery for awhile. Back then I was a working homeless, so I made a significant investment and bought a battery to run the homemade HVAC system in my car and operate fans. I thought Renogy was a reputable company, it was advertised all over the place, right? Right?

Wrong. The battery began to fail after less than one year: cell voltage imbalance, then the BMS shuts the battery down when 90% capacity still remaining. The condition won't reset until filly charged. So... it became an unpredictable letdowner, not a battery - it failed me when I needed it the most. Now that it's well past warranty, I will do as you said, and open the can with a heat gun. Maybe I'll replace the BMS with a third party one, or remove it altogether. Let's see what happens. Thanks for the good channel!

[scottpetersen]

Just bought a lifepo4 Renogy Lycan 1075wh power box, which had no capacity, partly balanced the cells manually, and it was greatly improved, bought an active 1.2a inductive balancer, and run a few cycles, it's gaining 45wh every time it's cycled, currently its up to 750wh.

[crezno]

So I have 2 of these, and the same thing happened to one of them. This is why I prefer the newer prismatic cell because they are typically in a 4S1P configuration internally for most batteries (unless its a higher capacity one like 400AH). These older renogys have multiple in parallel and in my case there were several dead individual cells and multiple batteries that have horrible self discharge. So I could manually charge each bank to full, and hook the battery up, it would be fully charged and work, but as you drain the battery as a whole I would have a bank that died faster then others, even if i didnt put a load on it for a few weeks. The only way to fix it, is to have 2 batteries in this state and combine good cells that dont have high self discharge, or potentially remove batteries, and drop it down to a 50AH battery. But that comes with its own issues because the BMS protections are for 100AH battery.

[ThelandshaperCEO]

What type of charger are you using that you can adjust the voltage and amps?

[region-]

What the temperature of the heat gun to remove the cover? I have 7 bricks from Renogy. and what BMS would you recommend if i wanted to replace it?

[jerrygundrum]

I wonder what happened to them? cold temp charging, super low discharges?

[jessiegrimmitt]

This is extremely helpful. Thank you for posting this! I have two SOK batteries that have never been used completley depleated (I didn't know how to care for the batteries when I got them, I bought them and just put them on a shelf (climate controlled, for 2 years) until I was ready to use them). We weren't sure how many amps to try to charge them at when bypassing the bms so this helped us. Thanks so much. Also curious about the capacity test you were running, should i do that too?

[hotscottpro]

I have an older BB 100ah that only puts out 52.4ah through Victron shunt.Bottom center of bat seems swelled.Or both sides of case got worn down?

[onthewater]

I've got a 50Ah one of these. Left it for three months (after one month of ownership, the thing was brand new) - that's all it took for one of the cells to completely die. Stuck at 9V, even if you leave it on the charger for a week. Going to pull it apart and see what I can figure out. Downright rubbish products - I had to threaten them with legal action for them to honour their warranty. Any pointers?

[stevenlouis]

noooo. Too many volts on a single cell. each cell max is 3.6volts.

[CitizenOfBabylon]

I had 3 of those, they're junk. The cylindrical cells run away, heat up, and lose capacity. Throw it away.

[swabby]

I've got the larger 170amp version of these batts. They really didn't hold up. Just over half capacity after about 5 years. BMS must be junk. 5 of the 6 are still going but one had to be removed from bank because it wouldn't balance no matter what I did. $8k worth of garbage batteries. Atleast they can be replaced for a fraction of the price now.

[jscarpetta]

Renogy is garbage, mine all had issues as well.