Ive been following this thread with great interest. I recently bought and installed the RC upgrade kit from fpvcustoms.com for my P3 pro. Worked awesome!! with a stock battery I managed to fly 32,000 + ft coming back into the wind. Emerg landed back onto my driveway at 6%. Not once did i lose signal which was amazing. When I bought the Antenna kit, I also bought the 3000mw booster battery upgrade. Paid an arm and leg for it all but it works great. Last week, I went crazy and bought the battery kit from him. Had I seen this post before that, I would have done things a little different. He sold me a P3 battery which he installed the xt 60 dual parallel plugs on, 2 carbon fibre battery mounts and 2 nano tech 1600mah 4S LIPO batteries. Ill be trying that out likely in the AM if the wind is reasonable. Ive also purchased from RC Dude Hobbies
Hyperion G6 HV 60C Max - 2400mah 4S Lipo the coveted and hard to locate, Hyperion G6 HV 60C Max - 2400mah 4S Lipo that you boys are drooling over. Most definitely, the weight difference between them and the 2800 version or even the 80c max 2400 version is substantial when these units are already gently crossing the weight line already. I will report my findings of this soon enough. Unfortunately, I also just acquired the Hi Tec X1 LIPO charger and will now need to hock that badboy off and purchase something like the SkyRC D100 LIHV unit. Other than that, were good to go...
If I had to do it all over again, I would have definitely purchased the antenna and booster upgrade but cooked up my own battery mod like seen here.