External battery for cell phone - what do you use?

Mophie

I used Mophies for iPhone for a long time, but stopped around 5S when I realized that lead lining the entire phone is suppressing the radio and forces the phone to work harder to talk to networks, draining the internal battery faster than without the case. Odds are, you're still getting a net positive from having the battery, but is it worth the weight and cost just for getting 50% of the advertised lifetime because you're killing the phone? I ended up packing a separate battery like the HyperJuice Plug. 18,000mAh for $110. It's useful for traveling or conferences when I won't be near an outlet and want to charge multiple things.
http://www.hypershop.com/HyperJuice/Plug/P18-BLACK.html

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