At first I was surprised, not invite the S3 but the separate battery. Covered also, like many others here, that you been attached the device and it is loaded. Find it so but ultimately practical. The S3 never have to's cable, you always have an operable mobile phone.
One can argue about price / performance - to me it is worth the price.
Slight criticism would be, that's not a double-cable here. But everyone who has an S3, should also have the right charging cable. (I got from my other electrical appliances already 3 such cables driving around at home ..)
(Note: Replace the batteries when S3 takes about a maximum of 1.5 minutes and remove with no stress off, battery cover, replace battery, turning on, enter pin ... before the thing running again ^^.)
