The D70S, in it's time, was a nice camera. It became the body of choice for British Road Speeding Cameras!
However, the price of a new charger was probably worth more than the camera.
It's not viable to get it fixed, but if you're handy with a small screwdriver, have a look inside, just be very wary about the flash capacitor.
This gives you a teardown for IR conversion...
https://www.lifepixel.com/tutorials/infrared-diy-tutorials/nikon-d70-d70s