Been waiting for this, just ordered one.

 

How long does this take to charge a 2100 mAh battery?

 

Thanks for the review. I ended purchasing one and it works great. One thing I would like to add is that using the original usb cable that came with the Samsung charger instead of the one provided by Seidio your phone will charge via AC mode (faster charging) while also charging your spare battery. This is a big plus for me. I found other chargers would only charge your phone via USB mode (slower charge) and take a long time to charge. Unfortunately the cable that came with the charger will not do this, but I figure you now have an extra cable to use with your computer. Thanks again.