Who has worn out a Lifepo4 bank?

[SKMT]

Theoretically they are supposed to last a very long time. Has anybody worn them out? How many years did you get? How much were they degraded or was it a total failure?

[wholybee]

I did some consulting on the rebuilding of a battery that was around 15 years old. On a large cat in Panama, so subjected to heat(considered very bad for LFP), and used for A/C. It was made up of 100 100Ah Calb cells for an original total of 2500Ah. It never had a BMS, but had a bunch of active balancers.

The owner was testing each cell individually and tossing those less than 90% of rated capacity. Then giving them a good top balance and rebuilding with a proper BMS. IIRC, most still passed, but he tossed about 15 of them. Those 15 were probably damaged due to overcharge from some balancers having failed.

Mostly, I think what you will find is people damaging them from overcharge or over-discharge. Or, batteries that are cheap seconds or recycled cells that were defective to begin with.