You can pick one up at Radio Shack, Sears Hardware store or Harbor Freight. You can usually get a cheap one for $10 or less, when you measure the battery you should have the setting on DC Volts.

Also there is something else you can try, but you have to do this at your own risk " I ASSUME NO RESPONSIBILTY IF THINGS GO WRONG".

What I have done in the past for rechargable battery packs that weere dead was take a 9v battery and connect a wire to the positive end and the Negative end of the 9v. Then the other side of the wires that are connected to the 9v battery touch the negative side wire to the negative side of the Nokia Battery Pack and touch the positive side of the 9v battery wire to the positive side of the Nokai Battery pack. Do this for about 30seconds to 1 minute and then put the battery pack in the Nokia and try charging it. It doesn't do it the first time try the sames steps again for a little bit longer, about 1-2 minutes.

What happens is the battery is so dead that the charging circuit will not charge it, the 9v battery will give it a little bit of a kickstart/charge and then it can be charged normally. Again this works most of the time but not all the time and I never had anything bad happen.

"AGAIN DO THIS AT YOUR OWN RISK"