Where to find this 5v battery?

Hey everyone, I am trying to fix the software on a certain cell phone that I have been using, I have all of the equipment to fix the phone, but the thing is, I need to take the battery out of the phone while I do this. The cables that I have to hook up to the phone have two alligator plugs attached to them which means I need to connect them to a power source to give power to the phone, other than the main battery.

I have found plenty of rechargeable batteries that have an external positive and negative pin that I can hook up to the alligator plugs, but all I have found are 9v batteries , which is way too much for a cell phone. I'm looking for any battery like i described that is 3v-5v.

To get an idea of what I'm talking about here are some links to the 9v batteries ive been seeing:

http://www.diytrade.com/china/4/products/3673588/J...

http://www.diytrade.com/china/4/products/2349687/9...

See those two circular metal parts on the top of the battery? That's where I need to clip the alligator plugs, but I can't find any lower volt batteries.

Is there any place anyone knows where I can find these? Or any other way I can give the phone the right voltage of power through another means?

Thanks.