I have a 10S11P pack that was reclaimed, a few others on the forum bought one too. I have it connected to a Flipsky 75200 and 65161 120kv motor. It’s worked quite well and never been hot, just a bit warm at the end up a session. I haven’t seen anyone report issues with it. I think @Foilguy has one too?
I think your 12S8P will probably work out for you. If you budget 3kW for takeoff power, that would be (3000W/43.2V)/8=8.7A per cell if you assume nominal voltage. If you assume the pack is getting low at 3.3V per cell you get 9.5A per cell. So not an outrageous demand on the cells, as long as you aren’t plowing around half submerged for a long time. Amps will drop down quite a bit once you are up on foil and you shouldn’t need to worry about it at that point.
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