I'm looking at building a 2p4s battery in this configuration. I was wondering if I could make the top and bottom buss bars from a single piece of copper rather than making individual cell to cell buss bars. The only down fall I could think of would be expansion and contraction of the cells but I...
I also didn't charge to 3.65v so the capacity loss is not all from 3.0-2.5v range. I think the temp played more into my numbers than I first thought as I'm testing in an uncontrolled garage and had outdoor temp ranges from 80-20*f for them two weeks.
Read everything I wrote. The test was how I was going to use them from 3.5-3.0v NOT 3.65-2.5v my cell tests from 3.6-2.5 were all over 230ah. Yes docan. I also think temp has a large part in cell testing. If I ever do more testing I will most likely set up a temp controlled box (cooler) to have...
I'm doing about the same setup 2p4s 230ah cells. I don't trust the ir readings of my tester. But I recently got an EBC-A40L and I've been capacity testing the cells individually and matched in pairs. My plan is to pair lower capacity cells with higher capacity cells to create as close to matched...
IMO the best way to do this is to capacity test each cell on its own then pair up the 3 cells in parallel so you have 4 packs of equal capacity. Then connect in series.
I should have defined this better. Same capacity cells. I've just done my own testing on the cells so say they are 230ah cells. One maybe 232ah to say 228ah.
Does anyone have insight on what is the best order of placing cells when say wiring a 4s pack. If I have 4 cells of different capacity should I put the highest two capacity in the middle of the pack, on the outsides or ??