I have had no problems with the 800mah LiPo pack lasting almost a month when being used everyday for controlling my ST for one daily bash around my track.

There are 1200mah & 1700mah LiPo packs that can be put in the FlySky battery compartment if you need a higher capacity battery. I will eventually get one also, but I'll wait until the OEM 800mah pack starts to go... I've been using the radio since April, so hopefully the 800mah pack will last a couple of years for me.