How about if your keychain could also be used as an extra charger for your Mobile Devices? This is what you get with the Solar Keychain.

The Solar Keychain uses solar energy, to charge-up. When your cell phone battery is down, just plug the necessary adaptor into the keychain and gain that extra talk time. You get some 15 to 20 minutes more.

This device can come in very handy, in a sticky situation, when you need to use your mobile device, but just run out of that last bit of battery energy for a quick call.  It costs $14.95.

[Via Coolest Gadgets]