lipo usb charger,
not
just a straight through power supply
from a usb cable as it needs a dedicated charger to
sense the voltage in the battery in order to cut off supply
to it.
You could then use this opportunity to replace the internal
battery, if desired, with an external single cell one that
you can remove to charge and wire on a JST or
connector (or one of choice) to power up the camera and
it’s transmitter. Longer life if higher capacity as the one
inside is only 250mAh and it would probably be a bit
more reliable!
If it is still partially working (normally because of a melted
servo) just disable the pitch and/or roll functions by
pulling out plug 2 and 3 respectively from the quad and
use it simply as a FPV camera.