4/18/2012
First blog! Trying to figure this out.
Today's project is a replacement battery for the logitech music anywhere for ipod.
It is supposed to glow orange when plugged in, indicating charging of the battery. Mine does not, and I suspect the battery has gone bad. The battery (internal) measures 0V dc with the voltmeter right now.
Logitech says the battery is made just for them, so not replaceable. However, a AAA fits nicely in the case.
The battery recharge connection on the internal board measures an oscillating 3-4 volts DC(?) with the voltmeter. Based on this I claim it is a 3.7V lithium ion battery.
I have purchased (2) li-ion rechargeable AAA size batteries, and some battery holders (I prefer not to solder with batteries).
The music anywhere transmitter comes apart easily: 2 small (jeweler size) screws hold the shell in place. Inside, 2 small screws hold the board in. The battery is glued down with something like rubber cement and comes up easily when pried. Remember to save the connector if you are disposing the old battery.
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Continued:
I connected the battery to the old connector and the box charged up, turned on and broadcasted!
However, a few weeks later it acts the same as before. I suspect the battery charging circuit is faulty- a voltmeter displays 2-2.5 Volts and the li-ion battery should require ~4 volts.
I believe the bad charging circuit destroys or disables the li-ion battery. Without a charging circuit I do not plan to repair the battery again. I will try to connect a power adapter directly to the board to see if it will turn on with direct power. It will no longer be portable, but perhaps will at least function.
