On Monday, September 25, 2017 at 6:31:19 PM UTC-6, Roy B. wrote:
Friends:
I am looking for a supplemental power pack that is easily rechargeable, reasonably compact, and will run my Oudie for 5+ hours on a single charge. Any suggestions?
ROY

Anything over a 3,000 mAh battery will run it for the longest of flights. The one Craig suggested is perfect. Will last multiple flights probably.