I just purchased a couple of these and all I can say is wow...
They fit snuggly in Phantom but compared to OE Phantom 2200 and Turnigy 2200's - I went from 7.5mins to almost 12 mins (that's with FPV, gimbal & aftermarket landing gear - close to 1280 gms)
http://www.2dogrc.com/mad-dog-2700-mah- ... -xt60.html
They fit snuggly in Phantom but compared to OE Phantom 2200 and Turnigy 2200's - I went from 7.5mins to almost 12 mins (that's with FPV, gimbal & aftermarket landing gear - close to 1280 gms)
http://www.2dogrc.com/mad-dog-2700-mah- ... -xt60.html