Hello All, I took the plunge on some CALB batteries off Ebay (same seller on AliExpress). They were 72AH Aluminum cased and marked as L135F72F "New - Grade A". They certainly look brand new, not a scratch on them or the posts, but it appears as if small barcode or brand sticker on top was removed, no other barcode was included, but there was a data sheet for the cells. I'm trying to evaluate what I have and seek advice from the more experienced people out there.
My BMS hasn't arrived yet, but the battery voltages as arrived were at 3.280, 3.280, 3.281, and 3.280. I've top balanced all the cells and then ran an approximate 0.2C test using an inverter load carefully monitoring everything. My two meters did not match exactly but one said 70Ah and the other was 72.5Ah when the inverter cut out and left the pack at about 10.95V, so it looks like these batteries are certainly in the range of what they should be.
Ending voltages of the cells were all within 0.02V of each other (actually 3 were nearly identical). I charged them back up a bit so they could "rest" while I wait for my BMS. Voltages are sitting at 3.321, 3.320, 3.320, and 3.320. So as far as I can tell these seem to be new with approx the full capacity and they don't seem to go out of balance much at all.
Are there any other tests I should do? Are these results typical of New, Matched cells?
I'm just trying to get a feel for what I bought because I know I was taking a bit of a risk (although the seller had a 100% rating and comments about how his batteries were matched and full capacity).
Thanks for any wisdom and advice.
Mike
My BMS hasn't arrived yet, but the battery voltages as arrived were at 3.280, 3.280, 3.281, and 3.280. I've top balanced all the cells and then ran an approximate 0.2C test using an inverter load carefully monitoring everything. My two meters did not match exactly but one said 70Ah and the other was 72.5Ah when the inverter cut out and left the pack at about 10.95V, so it looks like these batteries are certainly in the range of what they should be.
Ending voltages of the cells were all within 0.02V of each other (actually 3 were nearly identical). I charged them back up a bit so they could "rest" while I wait for my BMS. Voltages are sitting at 3.321, 3.320, 3.320, and 3.320. So as far as I can tell these seem to be new with approx the full capacity and they don't seem to go out of balance much at all.
Are there any other tests I should do? Are these results typical of New, Matched cells?
I'm just trying to get a feel for what I bought because I know I was taking a bit of a risk (although the seller had a 100% rating and comments about how his batteries were matched and full capacity).
Thanks for any wisdom and advice.
Mike