eneloop batteries - eneloop is a rechargeable battery.

Sony is offering a special PowerPack at Costco that includes a four position charger, 8 AA, 4 AAA, as well as two C and D size adapters (you can put four AA batteries into the adapters and use them as C and D batteries).

The neat thing about the eneloop over traditional NiMH batteries is they retain their charge longer on the shelf.  I just started testing  (AA in a digital camera and AAA in my voice recorder).  I will post a follow-up after I have some real world experience and stats.

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