Replying to Shit dying on the mountain

So I am super new to filming, I film on an iPhone and have a dji gimbal, but either the iPhone or the gimbal always dies. It is at full charge and I go up the lift and when I get to the top, and it just craps out. What should I do? I wanna film effectively without having to go into the lodge every run to recharge stuff and not bring a ton of chargers and whatnot to the mountain. What should I do? I've been starting to find the whole process of filming and editing very fun and want to make it even better by eliminating the stage of dying gear