flown thru pattern stuffonly - yes
If I flog it hard - 7 minutes
The specs you see are highly misleading --If you run LiPos to ove 75-80% of rated capacity -they die an earlier death
I run my cells flat - usually 2000-2100 used out of the pack.
The LiPos presently give a little more duration but when you compare cost , life etc., th A123 beat em - easily.
My cells get warm - never hot - I charge in th plane in 20 min or less -or swap n charge -
A pack is 45 bucks made from EBay cells .
No $$$ packs for me on larger electrics