This ready to use battery not only holds its charge up to 1 year but can be used right away, out of the box.  Overnight charger holds 2-AA or 2-AAA Ni-Mh or Ni-Cd batteries.  Batteries included are 4-AA 2100 Mah 1.2 volt Ni-Mh Always Ready Batteries.  Main features are 2 independent charging channels, low battery leakage current which holds a charge longer, reverse polarity protection, and multi-band LED monitor which tracks charging progress.

• Use out of the box
• Can be charged up to 1,000 times
• Up to 6X more photos
• Saves money and the environment by recharging instead of replacing