I've mucked around with solar chargers and cheap battery packs, just got this;
Waterproof 10,400mAh Portable Rechargeable Power Bank | Lithium Rechargeable | Storage/Batteries | Power Products Electrical | PRODUCTS | MB3728 | Jaycar Electronics New Zealand
Charged my iPhone 6s four times, it's half used. It's the ducks nuts so far...
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