Greetings my fellow nerds.
I need to replace cells in a 2p7s NiMH battery. The problem is that the charger that this battery is hardwired to is a non-balancing charger that basically just applies 10.5V voltage and can be current limited, but it has no means to balance the cells. I have a excess amount of cells and would like to give this battery best fighting chance by selecting batteries with matching IR to avoid damage during charge cycles. Should i be matching cells with similar IR at low SOC, at 100% SOC or by some other criteria like IR vs SOC slope? I am also thinking of sorting batteries in the two banks in reverse order, by IR, and adding connections between cells in two banks to basically have a cell with high IR in parallel with a cell with low IR in the 2nd bank etc, hoping to have similar IR across every cell and prevent overvolting any one during charge cycle. Any suggestions?