I'd like to build a setup with many small 3s packs, so it's easier to disassemble, isolate and replace parasitic cells when necessary.
Any suggestions ?
The best build is one you don't have to disassemble, isolate, and replace parasitic cells. How is this accomplished you say?
Suggestions, as you asked for them, would be to test every battery using proven methods to eliminate parasitic cells..
Flow charts are available to follow:
https://secondlifestorage.com/index.php?threads/18650-harvesting-flow-charts.9714/#post-74868
There is also much discussion on how to test and verify cells for your build. I personally go overboard and test to the nth degree but then again after all the effort of harvesting/liberating a cell and building a pack I certainly don't want to have to do it again very soon.
See:
https://secondlifestorage.com/index.php?threads/wolfs-powirwall.7804/post-72754
What settings should I use to do a discharge test with the B6.
I have the B6 , B6AC , and the Hitec X1
LiPo 3.7
Discharge to 3.0
0.5 amps
As far as your original question probably need to do a manual settings on the charger/discharger/analyzers as they are really designed for battery packs. Also the LiPo setting may not be ideal. Not sure if those units have a LiIo setting. I only have iChargers X6 and X8.
You can certainly use it/them to test each cell but you will be there forever. Once the packs and battery is built you can certainly use them to charge /test the battery and or test the individual packs if you choose to go a modular route.
The C/D/C testing or each cell would be, charge to 4.2V, discharge to ~2.8V, and recharge to 4.2V, all at a 1A setting, and recording the discharge mAh. Easier to get an OPUS that does it natively.
25 A max draw . If you have 50 cells in parallel per pack that would be 0,5A draw per cell quite acceptable with ≥ 2000mAh cells that would give you about 4 hrs. at full throttle. The more cells in parallel the less mA draw per cell the longer the battery will last.
I would build parallel modules and combine them into a 3s battery.
A 50A BMS should cover the amp draw.
Wolf