Originally Posted by galaxyuser88
Electronics 101-- when you take 2 batteries of the same voltage and hook them together in parallel
They're not run in parallel. They're run in series. The Powerskin battery charges the main battery, draining itself to do so AFAIU. It's going to never give you 2x the battery life if it's even an identical battery to the SR battery, as it's going to lose energy to heat in this process of charging the original battery. It does plug into the USB port on the phone from what I understood, as I heard complaints that it didn't allow a data connection through that port, only when you took off the Powerskin.