A:Answer You can somewhat calculate this by dividing the battery bank size by the size of your phone battery. Assuming your phone battery is completely flat and rated at 5,000 mA, this battery pack is 20,000 mA and will recharged that particular phone almost four times. Because 20,000 mA battery bank divided by 5,000 mA phone battery. The only problem is that you will be using this battery for everything else, too. Depending on your type of camping, you might need to consider a small 1 Amp (1,000 mA) USB solar panel or a large one, perhaps 2 Amps to share with your mates and all of their cool tech. Keep in mind that solar panel ratings are taken on a bright sunny day in ideal conditions. Don't forget that the camp site next to you didn't bring a battery and now you are the friendly electric power company. Always bring extra!
