Is the Phantom 2+ V3 battery compatible with the new phantom 3?

No.  3S for the P2 and 4S for the P3.

Tahoe_Ed Posted at 2015-4-9 01:34
No.  3S for the P2 and 4S for the P3.

This makes sense.  1. the technology is moving  2. more money for people to buy batteries.  

Really??? Just look it up yourself straight from DJI instead of posting it:

http://www.dji.com/product/phantom-3/faq

flydronefly Posted at 2015-4-9 03:48
Really??? Just look it up yourself straight from DJI instead of posting it:

http://www.dji.com/prod ...

Hillarious! Just wait for this forum to get going to see how many questions of this ilk are going to be posted... we're just too lazy to do a bit of research or even read the manual