Currently considering a flashlight that can act as powerbank. Just something to carry in the day bag/pack, and keep the phone topped off, together with some spare batteries.
One is MecArmy MOT10, uses 18650s has micro usb for charging, and full usb for charging other devices.
http://www.mecarmy.com/product/details/118/162Another few options from Rofis, the mr30, mr50 or mr70
The first two use 21700 lion effectively making the flashlight a 5000mAh powerbank.
http://www.rofislight.com/products/rofis-mr30/
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