I have two different batteries but only one charger. The charger says it can output 9V at 550mAh but its for a 7.2V Battery.
Could I use the charger above to charge the batteries below?
I have two 9.6V batteries, one at 700mAh and another at an unknown mAh.
Also could I use both type of batteries (7.2V and 9.6V) on the same SNES portable? I'm guessing yes and that it would just get hotter because of the 7805 chip.

SNESp Progress:
Have Screen fits perfectly, now to figure out how it works...
Motherboard (Fried) FC Twin & Mini SNES
Batteries 7.2V 2000mAh & 2x 9.6V 700mAh
Case ZN-40
Electronics came!