wrote on 6/2/2016 1:33 PM:
On one long flight (4 hours) my iPhone battery went pretty low, %20,
so an extra battery pack would be needed for longer flights.

I use a USB converter designed for autos (plugs into a power
socket/cigarette lighter), so the iPhone runs off the glider battery. I
put a power socket on the panel to plug it into, but others solder wires
to it and put it behind the panel.

The first one ($20) caused enormous static on the radio; the second one
($8) caused no static at all. My iPhone 6 pulls 200 ma from the glider
battery.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)
- "A Guide to Self-Launching Sailplane Operation"

https://sites.google.com/site/motorg...ad-the-guide-1
- "Transponders in Sailplanes - Dec 2014a" also ADS-B, PCAS, Flarm

http://soaringsafety.org/prev8)entio...anes-2014A.pdf