The various 830-850 LiPo's which now (mostly) come in at least 10C variant could well be a "sweet spot" for Blade/shockie type planes. irate/Apogee/PolyQuest (and others) all have 10C batteries in this mAh range. They're obviously going to be heavier than 340's but it's a small price to pay for more than twice the duration and they don't sag so much under load so you'd probably get even longer from them as you wouldn't need so much throttle. I've been using 2S Etec 1200 (just cos I had them) and Kokam 3S 340 so far but I'm going to order a number of the Polyquest 850s from www.aircraft-world.com soon as I think they could be the best batteries for my Blade and shockflyer.

Cliff