To recap:
Recently gotten hold of 2nd Life cells, having had an immense difficulty as GRO said, getting them to and keeping them balanced at a SOC of >95%, I did the bottom balance.
Reed kept on telling me to bottom and top balance, vid after vid he sent.
The Bottom Balance method I followed:
Drained all the cells to 2.8v, inverter got them to like ±3.1v, rest I took out using “The Bulb V2”.
Then I connected the cells in parallel for 48 hours.
After that I recharged them to 100% SOC, watching how they stayed in line all the way up to >95%.
At >95% I then helped a cell or two with “The Bulb V2”, and once things calmed a bit …
I discharged the bank down to 30% again with normal use.
Since then I seem to have a between 0.004 - 0.015v difference at 100% SOC, with the cells keeping in very close proximity as they recharge from SOC of 30%
It was fun, tedious, but fun.
Today I can say with the utmost conviction:
If you want to know what your cells are doing all the time, get a BMS that can show one the individual cell voltages all the time via i.e. one’s phone, whilst the BMS is interfaced with the system/Venus.