if i do a capacity test on 30Q or 40T
ill get a curve like this

if i repeat the test a couple times the curve smooths out

and step 1-4 will jump from 183mah to over 300 mah

you can see the testing here
viewtopic.php?f=14&t=106550&start=25#p1604360
Sounds like something from a different chemistry familygoatman wrote: every 50 cycles you should do a 0.6 amp discharge to 2.5v to double the lifecycle of 30q and 40T
went googling and came across an article on the SEI layer
Had you previously determined if all these 25 cells ("5 cells at 1.97v 1s5p" and "20 that were 3.28v to 3.03v") were suffering from moderate to high self-discharge?goatman wrote: ↑Feb 24 2021 6:49pmgoing to desulfate some salvaged 30Q from bad packs
5 cells at 1.97v 1s5p
charged to 4.2v at 3amps
then discharged to 2.5v at 3amps (0.6amps) curve looks fine
charged to 4.2v at 3 amps
then i discharged them a little bit and theyre sitting at 4.02v . now just put them on the shelf and see what happens
had another 20 that were 3.28v to 3.03v, taped them together to equalise
theyre sitting at 3.22v right now, in a couple days ill make a 2s10p pack and desulfate at 5amps