Hi i have a problem that i'm trying to solve my nikon camera has no way to charge from usb. it says 9v 2.5a on the bottom i assume for an ac input, however the battery is 7.4 volts. could i use a nikon dummy battery (designed to be pluged in at home) and a 2s lipo battery rated at 7.4v (linked below). is there anything else i would need to do??? i dont want to fry my camera. edit* its for time lapse's so i can shoot for long periods of time without changing batterys
https://hobbyking.com/en_us/turnigy..._4CYmK9_tdFcer2sERBoCwQsQAvD_BwE&gclsrc=aw.ds
https://hobbyking.com/en_us/turnigy..._4CYmK9_tdFcer2sERBoCwQsQAvD_BwE&gclsrc=aw.ds