Hello
A battery pack I am trying to replace has circuitry I'm less familiar with or I understand less than I thought. It has three wires coming from two 3.7V cells wired in series making it a 7.4V. But instead of finding a thermistor or thermally variable resistor wired into the negative I find what I think is a fixed surface mount resistor on a small rectangular board on the positive side of one cell that seems unaffected by heat or cold. Multimeter set to 2K ohms reading .555 Ohms. Number printed on resistor is 195. I suspect this may be a discharge or overcharge sensing circuit.
Voltage between Positve and Negative are the same as reading from resistance circuit.
Incidentally the failed cell doesn't appear to have any monitoring circuit and is puffed up and is failing to function properly as a result of breakdown.
I cannot find a direct replacement battery assembly for the Bluetooth speaker I'm fixing. I found a similar but larger one with 3 wires but I can't be certain the circuitry is right.
Looking for advice from anyone willing to give it, on sourcing proper sized battery cells to build my own from what I have or if I should buy the battery that seems close and transfer the board from the damaged pack to the new pack. Or anything other than these options I'm thinking of.
Thank you in advance
Troy
A battery pack I am trying to replace has circuitry I'm less familiar with or I understand less than I thought. It has three wires coming from two 3.7V cells wired in series making it a 7.4V. But instead of finding a thermistor or thermally variable resistor wired into the negative I find what I think is a fixed surface mount resistor on a small rectangular board on the positive side of one cell that seems unaffected by heat or cold. Multimeter set to 2K ohms reading .555 Ohms. Number printed on resistor is 195. I suspect this may be a discharge or overcharge sensing circuit.
Voltage between Positve and Negative are the same as reading from resistance circuit.
Incidentally the failed cell doesn't appear to have any monitoring circuit and is puffed up and is failing to function properly as a result of breakdown.
I cannot find a direct replacement battery assembly for the Bluetooth speaker I'm fixing. I found a similar but larger one with 3 wires but I can't be certain the circuitry is right.
Looking for advice from anyone willing to give it, on sourcing proper sized battery cells to build my own from what I have or if I should buy the battery that seems close and transfer the board from the damaged pack to the new pack. Or anything other than these options I'm thinking of.
Thank you in advance
Troy