I built and run my own e-bike including a 48V Li-ion battery pack. I’m familiar with their risks.
The first problem is working out how to unscrew the cap to access the internals of the battery/control unit.
I’m pretty sure that the smooth shiney bit at the top with the 4 slots unscrews from the threaded bit below along (wobbly) red line.
The only safe way to get a purchase on the main body would be to make an adapter to screw onto that threaded lower part, and if anyone here had done this, they might have suggestions on what that tool should look like. Ie. What size/pitch is the thread; is it normal or left-handed; how are the wires/circuit board underneath attached etc.
If not, i’ll just have to work it out for myself.
The other thing I need to do is purchase replacement(s); and for that I’d liek to get some advice; but presumably that should be in another thread