ok i have a 35% toc yak 54 running a dle 111v2 smart fly system ATM im running 2 fromco 5200 mah lithum ion packs but looking to change them to same weight but dont want to drop the mah down to far with a full days flight i burn roughly 4000 mah up any ideas of a good battery pack that has enought mah but is around 6.6 oz or less