After leaving the the Nexus 6 and battery life being somewhat of an issue you'll be quite surprised with the strength of the iPhone 6 Plus battery. Trust me I KNOW! My last phone after my note 4 was a Nexus 6. And I do travel a lot as well for work and being in airports often I rarely need to utilize a wall outlet. If you really want to be prepared for a long stint away from an outlet get a battery pack to charge your phone. The battery cases are great but add a great deal of bulk to the phone. I rock one with 12000 maH and I rarely use it!
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I got some 6000mah battery pack which I've used with my android devices. I've read iPhones had poor battery life but I remembered when I had a iPhone 4 it was fantastic.
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