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I've commented on the short battery life of Smart Phones couple times in the past: True GPS vs. Smart Phone GPS and New York City - The Smartphone Camera Report. If you have a phone with a replaceable battery, things get simpler and you can have a spare jusrt as you would with a camera or any other device you depend on in the field. However, with the iPhones not allowing for that, life is a little more complicated. However, it is not all that bad on that front either.

Jackery Bar 5600mAh will provide two full charges for your iPhone. Combine that with making sure you leave with a fully charged phone and you will have 3 full cycles on hand, finally providing some freedom to use your device for navigation, mass transit info, and location photography.

Just don't forget to pack a cable too, I recommend an extra one so that your primary remains safely at home just in case. I know companies sometimes go to extra lengths to make sure only OEM parts work but I've had a good luck with the Amazon Basics line of iPhone cables so far, like this AmazonBasics USB A to Lightning  for recent iPhones with the Lightning connector.

Need even more capacity or to charge two devices at once? Step up to Jackery Giant 10400mAh for only $10 extra!

Have fun with your smart devices!