I was doing some experimentation with wireless charging on the N900 and I noticed the back-up battery in the phone. This battery is designed to keep the RTC(real-time clock) running when the main battery is unplugged. My phone is quite old by now so I am pretty sure it is gone and the RTC is lost every time I swap out the main battery.

Based on my research it is most likely a rechargeable Lithium Iron Phosphate battery with nominal voltage of 3.2V but I may be completely off.

I searched on DigiKey but I can't seem to find any coincell battery that is even similar to that size.

Can someone shed some light on this?

http://talk.maemo.org/showthread.php?t=90864

If joerg_rw's run out then I have one spare. I have three and only two phones to replace them in. Replacing was easy in one, just need to get around to doing the rest.

sweet ! thanks ! I'll hit him up and see if he has any extra ones !

If not, DigiKey has some in stock and I have an order coming up so I might tack it on !