suggestions for a good power bank

[JeepCar]

Hi. How do you keep your phones or cameras charged when they go dead? Which power bank do you use when you go fishing or hunting? Do you have some suggestions on that? Just wanting to find a good external battery charger, thanks!

[JeepCar]

Has anyone ever used a power bank? I have searched many brands on amazon, and eventually I ordered this one:RAVPower 14000mah external battery pack. With large capacity, reasonable  price and many good reviews, it is said that it can charge iphone 6-7 times when it is fully charged. And one of my friends also recommended this one to me. If someone else has the same need, you can also have a try, in case of phone runs out of power. 

[rolmops]

I don't know, When I'm either out in the woods or on the water it is without any gizmos or gadgets.They are in my car where I can charge them when needed.