Need more juice for your gear? The eneloop Power Pack Kit [$33.00] by Sanyo is a very cheap and energy-efficient rechargeable battery system. Eneloop works with any device, and one AA battery has the same power as 1,000 alkaline batteries!

The kit comes with 8 AA and 2 AAA batteries. An adapter is included to convert them to C or D batteries if needed. While a little expensive up front, the eneloops provide power for much longer and are much more durable than the typical rechargeable battery.

Buy | Amazon.com [$33.00]