Have you seen my Post? YOu might find it interesting for when you go on Hikes... A way to charge your mavic batteries in remote locations. I have 4 of these battery packs and can charge 14 mavic batteries with them ( 7 per pair of battery banks) Seen you mentioned you do hikes, thought would be fo use to you.
http://mavicpilots.com/threads/hiking-mavic-pro-battery-bank-charging-system-proven.11443/
http://mavicpilots.com/threads/hiking-mavic-pro-battery-bank-charging-system-proven.11443/
