Definition: Batteries for digital cameras can range from AA size to NiCad (nickel-cadmium), to NiMH (nickel-metal hydride) to lithium ion. - nickel cadmium (NiCad): Rechargeable batteries that use an alkaline electrolyte. They have a longer life than non-rechargeable batteries. NiCad batteries have a memory, so they need to be run all the way down before recharging. Otherwise, they will begin to run out of power sooner. - nickel metal hydride (NiMH): A rechargeable battery that lasts longer than a NiCad and has no memory, so it is easier to manage. - lithium ion: More expensive than either the NiCad or NiMH, but holds a charge much longer.
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