Best AA Battery Charger for iphone 3g

[sonex]

Hey just wondering if these AA battery chargers for the iphone 3g actually work and if they work well.

e.g. http://cgi.ebay.com/ch04-AA-Battery-Emergency-Charger-For-iPhone-iPhone-3G_W0QQitemZ250294778200QQcmdZViewItem?hash=item250294778200&_trkparms=72%3A1163|39%3A1|66%3A2|65%3A12|240%3A1318&_trksid=p3286.c0.m14



I wonder if anyone has experience with these, and what they would recommend as the best and cheapest charger :)

Thanks