Nikon Coolpix 100 User Manual page 21

Batteries
When you turn the camera on, check the battery level indicator in the control
panel to determine whether the batteries need to be replaced. See "Checking
Battery Level" for a description of the battery level indicator.
Replace the batteries with AA alkaline batteries. Do not use nickel-cadmium
batteries.
On cold days, the capacity of batteries tends to decrease. When taking
pictures outside in cold weather, keep a spare set of warm batteries on hand.
9
Before You Begin : Cautions