USB Battery

Batteries have reduced many a grown person to tears. Whether they're in your flashlight, Speak N Spell, laptop, or MP3 player, they always seem to be dead when you need them most. We can debate the pros and cons of other technological advances, but when it comes to batteries, everyone is in agreement that it's time for a better mousetrap.
A few new technologies, most available today, are worth looking at.

A USB/Battery Combo: The USBCELL battery can be recharged when you yank off its head to reveal a USB plug. Recharge the battery from your laptop or any other powered USB port. Snap the head back on and you're good to go. (About $19 for two batteries.)

No Pre-charging Required: Hybro, a new rechargeable battery from Uniross, is—unlike most rechargeable batteries—ready to use right out of the package without charging it first. The manufacturer claims it'll last four times as long as a standard rechargeable battery. It'll retain its charge for months and is rechargeable up to 500 times. Two AA batteries are $13.