justruss Offline Upload & Sell: Off
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Other things that work quite well:
Large USB-battery packs.
Large USB-battery packs coupled to the car.
Large USB-battery packs coupled to a cheapish, fold-out solar panel.
Bonus points for USB battery packs with: multiple inputs for faster charging, the ability to pass through so that they can charge external devices while hooked up to the car/solar themselves, industry-standard fast-charging.
I used such a USB + solar setup late last year during a 3 week camping trip. Left the panels ($50) tied down to a table/ground/car/tent during the day, charging the battery pack. When covering longer distances, charged the USB pack via the car. Battery pack was used to slowly charge A7rII, phone, laptop, etc.
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