Phantom v1.x owners with battery envy can build their own 5400 maH with an easy mod that doesn't add a lot of weight, doesn't require removal of legs, gimbals etc, needs only minimal or no wiring knowledge, and can be done for coffee money, OK Starbucks maybe...Centre of Gravity is maintained, and you can use those extra batteries so no special new battery is required. All in all pretty cool..
watch how its done:
http://youtu.be/vWe-D83Ri5Y
watch how its done:
http://youtu.be/vWe-D83Ri5Y