I have ordered one of these.
http://www.ebay.co.uk/itm/360623491533? ... 1439.l2649
Its available your side of pond as well locally.
My first 2 flights today were just over 8 minutes long before I was starting to get a blinking red low voltage light.
With the timer I will know I need to get back pronto at around 6-7 minutes point.
I also forgot to adjust my phone brightness to max as well so I can better see whats happening.
Lots to learn though I have the benefit of heavy flown nitro powered belies about 15 years ago, which was a real challenge, though I can't say I was that good at that.