I just did a full draw down and power cycle on my calb cells I bought from Jimmy in october. I was not able too do this properly before due to temp issues. -15°c is bad for balancing and charging i hear...
Cells are 2nd life CALB se 200's. seller claims they are grade A new. After several offline discussions we came to the agreement that they are shelf queens with occasional pulls from large packs that are going through their replacement every 2 years.
Remember international law forbids the transfer of hazwaste to another country to avoid rich countries sending their crap to another poorer country....
They are listed as 200 a/h, and were in a 2p4s pack. they produced 390 a/h average on three draw downs and recharges. average recharge was 410 so they are used but they are in good shape. this was measured in the following manner. magnum 2012 with BMK measured 390, 384, 396 drawdown. powering all the lights in my shop and a fan to keep area clear over 11 hours. this was double checked with a DROK meter, and the pack was in 15°c temps . so 195 from a recycle cell. recharge was with a 12 volt charger through a daly BMS with cutoffs set at 3.65 per cell or 14.6 for the pack at 50 amps.
Pretty damn good for the price and the lack of bullshit IRT shipping and ordering. no bloated cells. no massive runners or sleepers. The cells were top balanced and drawn down three times to get this result. they will go into my system as a back up to the 30kw 48 volt pack that powers my house, power the heating pads in the winter and float though the year except when needed.
These are from the third batch i ordered from Jimmy. one order of 32 cells, one order of 16 cells and one order of eight cells. the first two were to make my house pack, the last 8 were ordered at the same time as the second as replacements/12 volt pack. The first two packs I could not truly test as winter was coming, but they lasted the winter with zero issues after a good top balance and are still running .003-.018 volts of variation. The .018 is during the high end of the charge and they quickly drop down to .003-.008 after charge is finished.
cheers
Ken
