Nifty project if you go on location a lot and need run lots of batteries. Check it out:
http://www.diyphotography.net/build-portable-charger-case-answer-power-needs/
DIY a portable charging station
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Tag Archives: batteries
FAA rules regarding extra batteries…
Good to know info on carrying and or packing your spare batteries on your next flight.
http://petapixel.com/2015/10/15/psa-never-pack-spare-lithium-batteries-in-checked-baggage-when-flying/
Link to FAA document