you could try one of the range of "Anker power banks" Anker PowerCore 20100 Ultra Capacity Power Bank Portable Charger - FAST DELIVERY for example. hope this helps you make a decision :D
I am yet to do any upgrades too my p3s but if you live in the uk maybe these guys can help Horizon FPV Antennas as I say I am unsure but I hope I helped in some small way.
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