This Emergency USB Charger converts the juice from 2 standard AA batteries into enough power to re-charge your USB gadgets in a flash. Mobile phones, MP3 players, it’s like giving them all a Duracell battery box, which can be very handy when you’re out and about.
The fact that I can pop into the nearest shop to buy a couple of batteries is one of the things I like most about the Flip camcorder for instance, and it’s really helped me out on a number of occasions in the past. Two batteries will deliver up to 4 hours talk time. $8.50.
The emergency charger with standard USB output interface that works with all the latest phones, PDA’s, and even has iPod Compatibility. The slim design and larger power supply by using 2 X AA battery hence can chat, listen to your tunes, taking photos and playing games for even longer.
If you combine this with rechargeable AA batteries you'd be in good shape. It could get costly if you needed to continually use batteries to charge your phone.
HKD25 = USD3.x in HK.