Im going to pick up this thread purely because it has people with relevant hardware, even though I think it is the battery that I need to repair here (rather than the CV 3620 AL charger from 2019).
I have a battery which gives a red overheat warning whenever you plug it in to the charger, even though it works ok and reports 2 (of 3) battery lights, and has never got hot. My initial assumption was that the thermistor has failed, but Im struggling to work out what to check since I dont have a good/working device to compare with. There is some information on google for repair, but its pretty useless tbh, hence I thought I would add a bit more information here and hopefully get some advice on next steps please
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When you split the middle pins of the battery you have negative on one side, and and I think the thermistor connection on the other, and it took me a while to spot the blank/filler/plastic on one side of the charger pin (hence the two metal prongs on the battery are not the same). I measure this 'thermistor' connection as 99.8kΩ to negative terminal (though that's without disconnecting the thermisor from the circuit which I know could be flawed).
What should the connection read, and is it possible to get a connection without desoldering the thermistor? Or is the connection to the battery more complex than just a 'resistor' check?