The recommended lipo is a 3S 2200mah which is fitted up front in the battery compartment and this will give around 6 minutes of flying. It actually says 10 minutes in the instruction booklet but this has to be taken with a huge pinch of salt. I decided to try a bigger battery to extend the flying time. I constructed a battery tray from balsa and mounted it inside the fuselage beneath the wings and used a velcro tie to hold a YKS 5000mah lipo in place. This makes a tremendous improvement to the flying time and the extra weight of the battery makes no difference to the performance. I would recommend YKS lipos, they are much cheaper than other batteries I have used and perform very well. I usually set my timer to 15 minutes and on landing the remaining capacity is always around 40% or so. It is possible to get 20 minutes out of the 5000mah pack quite safely. This might be ok on a Summer day when it is warm, but on a freezing Winter one, 15 minutes is more than adequate before my fingers start freezing up.