AA cell - In the digicam world this refers to the most common power source, the AA-size battery. See also "NiCd" and "NiMH"
and check here: NiMH Batteries/Chargers ...
A 1800mAh AA cell and
A 4500mAh D cell
For instance, a battery rated at 500 mAH means it should deliver 500 milliamp of current for one hour under constant load.
It runs on two AA cells.
It's all anyone really needs if money matters.
Pudgy Portable: $600 top ...
The most common battery grips can contain either two regular camera batteries (frequently disposable 2CR5 or rechargeable BP-51x, depending on whether they're film or digital) or else a number of AA cells.
Some of the camcorders on the market have built-in, non-changeable rechargeable batteries, others have removable lithium ion batteries while at least one comes with a rechargeable battery that can be swapped for standard AA cells.
Sure, they're boring hunks of gray plastic, but lithium-ion batteries (as well as AA cells) are probably the most critical part of your power-slurping digital camera. Without these batteries, the picture-taking fun comes to a screeching halt.
This allows the use of two LP-E5 batteries or 6 AA cells. The BG-E5 has built-in camera control buttons for easier vertical shooting, including shutter release, AE/FE lock, Main Dial, and and aperture/exposure compensation button.
 See also: Flash, Camera, Batteries, Light, Lens
  
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