Here is some info for you. NiMH batteries are the way to go.
• PERFORMANCE: NiMH batteries will greatly out-perform standard NiCd batteries in high-drain applications.
• VOLTAGE: The power produced by the battery. Both NiMH and NiCd have virtually the same voltage.
• CAPACITY: The amount of energy stored by the battery. NiMH has more than twice the capacity of standard NiCd. This results in much longer runs times (hours, # of pictures).
• MEMORY EFFECT: NiMH batteries can be charged or “topped-off” at any time without affecting battery life. In order to achieve optimum performance from NiCd batteries, they must be fully discharged before recharging. Unlike NiCd batteries, NiMH has No Memory Effect.