I have this Bluetooth receiver. The battery is not holding a lot of charge anymore so it's become pretty useless. I can't plugin the device and use it at the same time, so I was wondering if I could remove the battery and use the cables that originally connected the battery to directly plugin the device. The battery is YJ402025 Li-Po 3.7V 160MAh. USB provides 5V so not sure if that's going to be an issue... I could take pictures of the device's circuit board if that would be helpful.
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Get a new battery instead? – kva Jun 17 '17 at 12:00
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I'm afraid it will (1) not last much longer than this one and (2) end up being more hassle. – kat Jun 17 '17 at 12:13
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If you do replace the battery with a USB supply, you should drop the 5 volts down to something closer to 3.7 volts. You could do this with a low drop out 3.5 volt regulator such as the MC33269T and a small heatsink or you could put two or three 1N400X type diodes in series with the positive lead of the USB supply.
Glenn W9IQ
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An LM317 will not work, as the dropout voltage is too high - https://electronics.stackexchange.com/questions/214371/lm317-dropout-voltage There are however adjustable LDOs which will. – Chris Stratton Jun 17 '17 at 14:29
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