Rechargeable batteries have been around for decades and the initial motivation was to save money. The up front cost was nothing compared to how much one could save over buying a similar amount of normal batteries over the long haul. Still, there was the fact that they always needed to be charged before use and didn't hold their charge for long.
The batteries are ready to go right out of the package.
Enter Sanyo's eneloop rechargeable batteries. They're ready for use the minute you bring some home from a store and open the packaging. They also hold that charge for quite a while. Sanyo estimates that a full battery will retain about 90% of its charge after 6 months, compared to 75% for normal rechargables. The huge difference is at one year, the eneloop will still have 85% of its charge while a normal one will be at zero. On top of that, the amount of usage you get per charge is greater than standard NiMh batteries.
Looking at the long term picture, the eneloop can also be charged up to 1000 times. If you use up and charge a pair of batteries once a week, you would get 19 years worth of usage! Sanyo doesn't offer a hard guarantee on that claim, but it shouldn't be far off from that.
If all that wasn't friendly for the environment, the batteries and even the packaging are made of materials that are far easier to recycle. The eneloop comes in only AA or AAA sizes. Adapters are available for C and D sizes. For more info, you can check out the official eneloop site here ."
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