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diy solar

Unable to finish top balancing Redodo Mini 12v 100Ah battery - why is this?

Mike from Houston

New Member
Joined
Jan 30, 2025
Messages
6
Location
Houston, TX
I bought a 12v 100Ah Redodo Mini LiFePO4 battery (no bluetooth) in summer of '23, along with one of their 20A 14.6V chargers. Early on, I put a few cycles on it and found it delivered full capacity on a discharge tester (which I have since smoked). Haven't done too much with battery since (couple of uses with a trolling motor) and have stored it about 1/2 full (timed charge from empty).

Recently decided to top balance it just for the heck of it. Pulled out my large bench power supply to do this and found that the BMS would go into protection mode at about 13.7V. So I tried setting voltage a bit lower to let it balance, but this power supply was a bit too coarse for the job.

After watching a video from Clark's Adventure on Youtube about top balancing new batteries, I purchased a smaller bench power supply to continue the top balance. I was eventually able to get the battery to get to 14.25V before the BMS went into protection mode. But I have been there for about a month now with no further progress, feeding it between 14.10 and 14.20V. Current fluctuates between 4-8 mA.

Has anyone else had similar difficulty top balancing one of these batteries? I'd even question if the BMS had a balancing circuit at all, had I not made a bit of progress from the beginning (total time >6 weeks).

I'm doing this more for my own education/experience, so my mission isn't just to put the battery into service (like in my camper or boat) and forget about it.






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Anything over 3.45 per cell and held for an hour will produce near 100% capacity.
Exposing the cell internals to higher voltages can cause micro cracks in the graphite and degradation of the battery.
I occasionally run my DIY packs up to 56.4 volts (3.525) to fine tune the balance but in regular cycling only charge to 55.6 (3.475) and float at 54 (3.375). Discharge to 49 volts (3.06) I achieve 98% of capacity using these numbers.
There is very little usable capacity above 3.5 and below 3 volts
 

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