“Hmm, my mobile phone is almost dead. Eh, I have to go now, no time to reacharge it, and anyway I’ll only be gone for two hours, it will surely last that long.” More often than not, this train of thought is followed by getting detoured by a friend and ending up with a dead phone at 3 a.m. in a club, unable to call a taxi.

I didn’t trust the previous emergency charger I wrote about – 3 hours from one battery seemed exagerrated, but it looks like it wasn’t. The iGo powerXtender, reviewed on OhGizmo!, can give a gadget 6 to 8 hours worth of juice using two AA batteries.

In order to use it, you need to get a tip for your specific device ($10 each), then just plug it in and wait. Unfortunately, Evan at OhGizmo! reports that it tends to randomly power itself off during charging, so if you’re aiming to fully charge your phone, iPod or console you have to keep an eye on it for shut downs. Other than this, it’s a priceless little device for anyone who’s ever left home and discovered his/her can’t-live-without gadget is dead.

How much under $29.99?
Some: $15.99 on iGo.com.

Via OhGizmo!