I have a rechargeable torch too, the cable mine came with was a micro usb to usb which seems to be a standard cable supplied with most modern rechargeable devices (phones, tablets, wireless headphones, portable speakers etc)
I just plug it into one of my now many usb wall plugs (or charge in my pc usb)
What cable do you have, and what is a c2g cable?
How does the flashlight instructions say you should charge it?