Depends on your needs but I've been using OmniCharge for the past 8 yrs - starting with their OmniCharge Pro (20,400mAh), Omni 20C (also 20,400mAh), and their largest Omni Ultimate (38,400mAh - supposedly largest capacity that's TSA approved).
If I do an overnight Timelapse, usually I use the Omni Ultimate - it drives the Vixen Polarie, and the Nikon D810a with capacity to spare for the next night. I guess I could have used the OmniCharge Pro too but I aim to be safe than sorry (since I'd be remote, far away from home or anywhere else).
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