Rechargeable batteries have evolved considerably (and gone down in price). Available in AA and AAA sizes, they're a great stocking stuffer. Rechargeable Hybrid Nickel-Metal Hydride (Ni-MH) batteries come fully charged and can hold a charge over many months. A quick and unscientific web survey of best rechargeable batteries around found the Sanyo Eneloop to be a fave. HYBRID is a word you should look for as these batteries can hold their charge over time (for low drain items like remotes and flashlights) but can take frequent use of high-drain devices like digital cameras. This article provides a great overview of the best rechargeable batteries and chargers.