Power Banks are an essential item these days if you use your iPhone or Android phones for leisure. I use my iPhone for navigation, route mapping, photography, videos, social media etc so it’s on most of the day running down the battery. This smaller 5,000mAh Power Bank should enable you to charge your phone a couple of time with a full charge over night. If you don’t want to carry a larger Solar Power Bank or you are not that power hungry with your tech then a few smaller ones might be the solution for you. I picked the red one for visibility purposes when you drop it!