A case is recommended as well, to keep them from getting beat up.

Panasonic Eneloop Rechargeable Batteries

If you are doing anything other than living a very primitive lifestyle, electronics are part of your life.  Batteries, or should I say good batteries, get expensive.  With a investment in some Panasonic Eneloop Rechargeable Batteries, you will be set for a loooong time.  Now in their 4th generation, these batteries are good for 2,100 charges.  Your device that these batteries are in will probably break or be lost before you re-charge them that much…

You can find the AA Rechargeable Batteries and the AAA Rechargeable Batteries here.

I use these little guys daily in all my electronics.