BMS, round two

I received and assembled the first three samples of the BMS boards. Everything looks good. I did some thermal tests, and each unit should be able to bypass one amp with a heatsink installed on the main transistor, and about twice that with a fan in addition. If I use the BMS to cut back on charging current when any cell goes over voltage, the bypass current should only be a few tenths of an amp, and I'll be able to dispense with the heatsink. That would be nice, as the heatsinks are a fair amount of work to install. Here's the top of the board, with heat sink installed:And here's the back. The cool thing about making your own layout is that you can write whatever you want on the board:


Only 93 to go...