Very compact CR123A battery micro-usb output charger. 500mA output.
Comes with a Varta professional 3.0V lithium battery.
I have tried with AW IMR 16340 battery, works ok.
With full IMR battery, I can charge my Sony Z1 Compact about %10-14 (around 250-300mah), thats good for any emergency.
Very light weight. For some countries with easy access to CR123A batteries, it is also practical.
It stops charging the phone when voltage near 2.5V –2.7V. I assume that is safe for the battery.