How did you connect the doubles up cells? Are all + and - connections doubled up?
Yes they will be four x 2p then series but had a dumb moment and realised I should use top balanced IR to sort them. Doing things in wrong order. Did the planned top balanced yesterday but stopped at 3.5v last night before I ran out of time to watch them. I let them settle overnight and today will take them to 3.6v. Then will let them settle for an hour then take their IR.
I have a YR1035+ so confident in the IR.
Also have ET5410 so after I build them in 2p4s config with their JK BMS I will take them from top balance down to cell cut off 2.5v (10.0v) in a 0.2C test and measure capacity while noting 3.4v and 3.0v capacity during the test.
Once the cells are in their 2p4s config I will operate them 3.0v to 3.4v. They are for a UPS and being B grade I will take it easy on them.
The ET5410 pack capacity test should tell me if my sorting and grouping by IR worked or not. Each paralleled cell voltage should be pretty close after settling after end of the test.
Top balance set up:
Pic below shows my method of sorting. This is the 8 worst cells I plan for one pack but need to update for top balanced IR later. mΩ after top balance is only correct for cell #1, that one I top balanced and capacity tested at 0.2C. The rest are from about 70% SOC so TBD for sorting.
I could capacity test them all individually but i have 16 total cells for two packs of 2p4s. At 5hrs per cell that's too long for my impatience. Even testing paralled groups of two is 40hrs testing time so 3 days real world since I wont wake up to start new tests at night. If the method described above doesnt work I will go the long route.