Depending on the version (and condition) of the boards, they are
repairable. The most common failure is of the optical relay that
isolates the cell module from the controller head. It's not a
particularly expensive part, and although it's surface mount (SMD),
it has only four leads, and can be replaced using common soldering tools.
I had to rebuild nine of the v.2 Mini BMS boards that I purchased
with the used Thundersky cells that are in my car now. There were a
variety of failures, many of which were caused by corrosion and
creepage between the cell/pack potential and automotive 12 volt
battery connections. Some through cleaning, PCB trace repairs and
half a dozen of the optical relays all is operational again. I built
a test jig to proof each board and gather LVD, HVD, balancing voltage
and current, etc.
I'd be glad to relate any info that helps you get these working, or
if you decide not to repair them, I'd be interesting in purchasing
the dead ones as possible spares for my EV. I have schematics for the
cell and head boards, etc.
Version 3 boards use an ATTiny microprocessor (AVR), and might be
repairable, but if the processor needs replacement, that's going to
be a sticking point without the source code for the chipset.
> Hi. I had a few minibms boards quit working and I was wondering if
> anyone had made a dropin alternative or had some that they might
> want to sell.
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