How to replace a iAudio X5 battery

any ideas how to obtain and change a battery for the iAudio 7? Please let me know. Desprate! Thanks!

Folks, today I replaced my X5 battery with a sonny ericsson mobile's battery, I don't remember the battery model but it's size was exactly like the X5 original battery. (let me know if anyone needs it's model as I have to open it again)
The battery specification is 3.7 V / 900 mah.
There is no need to test the poles to find the positive one as it already has the signs, second it is covered with kinda plastic frame to prevent any sort of short circuit.
It is working perfectly.

is the link for the battery right until today...?just to be sure...

Yes, it still points to the battery I bought

THX MAN very helpfull video!

How is the battery lifetime now? Has it decreased a lot, or is it still about 7 hours?

Excellent instructions guys! Thank you!

The extra ~1.3V are needed to "pump" the charge.

I soldered the red wire to the (+) terminal and black wire to (-) terminal on the circuit of the DS battery. (Check polarity of the original connection if in doubt!) The terminals are the metal squares visible on the unopened DS package. The circuit becomes visible once the DS battery package is open (unwrap the sticky label and gently push the battery out of the plastic frame). Insulate the package.

You can get a battery made for the IAudio X5 on EBay, just do a search.