[PSUBS-MAILIST] Magnacom SW-1000-sc Battery

[Alan James via Personal_Submersibles]

 David, how are you going with your battery problem. Did a little bit of googling on NIMH batteries & found this.... Unfortunately charging NiMH nickel metal hydride batteries is not as easy to achieve compared to other types of cell or battery. The NiMH cells, like NiCds require charging using a constant current. The rate of charge is normally specified on the case of the cell and this rate should not be exceeded.
It looks to me that the electronics would be a constant current charging circuit. Maybe it has an over voltage cut out. You could possibly leave the circuit out & buy a Nimh charger suitable for 12V & take them out & charge them. Alan

    On Thursday, December 17, 2020, 06:39:22 AM GMT+13, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi guys, I torn down the one battery I got with my magnacom units so I can build a couple more.  Attached are photos of the teardown. Only problem is one component that only had labeling on one side. The other side had only the letters va with a smudge over other data. I think it's a fuse based on the fact it interrupts the circuit.  I sketched out the circuit for reference. I thought taught there might be a BMS, but apparently not.  Jon, to recreate the circuit board component, would you recommend having done by a fabricator? Any ideas or thoughts would be appreciated.Thanks,David_______________________________________________
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