iPhone 4/4S Battery to Power Supply cable name

Hi everyone,

I have couple of iPhone 4 and 4S and I want to do a little project with it. I want to be able to power them from a power supply, and I saw in a couple of videos that it's actually possible. People usually cut the battery in order to get the cable :

https://youtu.be/3GW7IYQcODY?t=177 at 2:55.

Do you know if this cable is actually available anywhere ? I don't want to buy 10 iPhones 4/4S and opened them in order to do my little project !

Please let me know if it's actually possible to order them from somewhere !