I removed the single cell li-ion battery soldered to the circuit board of a Samsung HM1800 bluetooth headset and replaced it with a 4.1v DC power supply. Unfortunately, the device refuses to power on reliably. I got it to power on once or twice, but it was performing erratically. I put the included battery back and it of course works just fine. I'm using a 5v/1A power supply and stepping the voltage down to 4.1v with an NTE956 regulator and some caps & resistors. The current draw when using the battery has never exceeded 0.5A when I measured it.
Does anyone have any idea what could be going on here?
What's with the unrelated video link?
Apparently it's what he is trying to use the BT headset for.
It could be drawing far more current than 0.5A in brief pulses, which can't be seen without a scope.
Guess I'm not too patient. I see some unrelated video and I just closed it.
Yeah we'd need to see what this mysterious regulator with "some caps & resistors" actually looks like, how long the wires are, etc. Probably losing regulation because of poor transient response.
And how the current was measured, with what, etc...