I don't know how they did it, but Casio has managed to extract incredible battery life from the NP-40 battery used by the EX-Z55. You can take a whopping 400 shots per charge from a battery with just 4.5 Wh of energy! Just so you know how great that is, the Canon PowerShot SD300 gets 140 shots per charge, the Nikon Coolpix 5200 takes 150, while the Panasonic Lumix DMC-FX7 gets just 120. Casio should be commended for their efforts in this area!