Well, the cells became more temp sensitive.
After being out a few hours in 50F weather the max sag reached 2V.
They still "got the job done" re. capacity after >2yrs.
So a few days ago I replaced the packs with some spares I had in the refrigerator for ~1yr.
Sag is now 0.4-0.5V max at ~70F
I have retired this system, for two reasons.
It's getting more difficult to get USPD parts, especially motors.
Also, I wanted more performance. Got tired of newer e-bikes whizzing past me.
I switched to a Bafang mid drive system.
In 9 years I replaced the cells twice, re-calibrated the voltage dividers once a year, blew out a motor trying to go up a too steep hill.
