I am not sure what the second set of pins are for but only the two higher up are needed for charging. I have been using parts out of a palm pre since the day I got my phone and it works great.
Why do I use it?
1. I hate having dangling cords and this is a much more elegant solution to any dock out there
2. Works as a dock at home, office and my car(with double sided tape) without having to fidget with the position
3. Cost like $12 for Pre back cover, charging base, cable and power supply on amazon.
Thoughts on the second set of pins:
1. Because you are adding extra metal in front of the NFC pickup which is on the battery, they might be moving the NFC pickup off the battery and onto the back cover.
2. Could be for selling a battery without NFC and still allow you to keep the capability for those that switch batteries during the day.
3. Visa PayPass which is on the Olympic versions of the S3 have a special chip. Verizon is going to have ISIS and possible it will need its own special chip. Could allow for future expansion to have that chip embedded into cover.
Why do I use it?
1. I hate having dangling cords and this is a much more elegant solution to any dock out there
2. Works as a dock at home, office and my car(with double sided tape) without having to fidget with the position
3. Cost like $12 for Pre back cover, charging base, cable and power supply on amazon.
Thoughts on the second set of pins:
1. Because you are adding extra metal in front of the NFC pickup which is on the battery, they might be moving the NFC pickup off the battery and onto the back cover.
2. Could be for selling a battery without NFC and still allow you to keep the capability for those that switch batteries during the day.
3. Visa PayPass which is on the Olympic versions of the S3 have a special chip. Verizon is going to have ISIS and possible it will need its own special chip. Could allow for future expansion to have that chip embedded into cover.
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