Batteries
Not much here as yet!
footnote for camera Li batteries

Normally

7.2 volts would indicate 2S Li-Ion and 7.4 would indicate 2S Li-Poly.
Since the charger doesn't know it's charging Li-Po, it might not charge it fully

Warning

Balanced Li-XX chargers work by charging until a certain voltage is reached and then dropping the charge rate slowly to zero, while keeping the voltage constant. It is known as CC-CV or Constant Current - Constant Voltage.
The real issues only start if you charge a Li-Ion with a Li-Po charger, which results in overcharging the cell, and the possibility of an explosion.