I run the 600mAh batteries in my LT40 and controller... I throw them on charge everytime between flights - just takes a few seconds and I have no worries.

FWIW - I'm using a Hobbico Quick Field DC Charger MKII 12 Volt along with a Hobbico TorqMaster LC 12V 7Amp Battery . Picked up the wall charger for the 12V battery as well as charging leads for my radio and Rx battery. The money spent on this gear is near that which I'd spend on the high capacity batteries. I'll get the higher cap batteries down the road but this works great for now.

My 2¢... worth around 0.5¢.

somegeek