Lets say you have 2 identical 5p packs laying around. They each have one low quality 30 amp BMS. You could wire the discharge cables together to create a "10p" pack with a effective 60a rating. But you will bypass one or the other bms when charging, which is bad. Among other things; the cons of perma-paralleling 2 packs are well known.
BUT...What if you disconnected the bms from each of the cheap packs and paralleled all of the pack wires together into one high quality/ high amp rating bms? So the 26 sense wires from pack 1 and pack 2 were merged into 13 wires going into the 1 bms. Same for the B+ and B- wires. The sense wires would effectively join the 2 separate 5p groups into 10p groups and any small imbalances would balance through the sense wire, right? Not that I'm thinking about doing this or anything, I haven't even bought the BMS yet..
BUT...What if you disconnected the bms from each of the cheap packs and paralleled all of the pack wires together into one high quality/ high amp rating bms? So the 26 sense wires from pack 1 and pack 2 were merged into 13 wires going into the 1 bms. Same for the B+ and B- wires. The sense wires would effectively join the 2 separate 5p groups into 10p groups and any small imbalances would balance through the sense wire, right? Not that I'm thinking about doing this or anything, I haven't even bought the BMS yet..