This is more an FYI on LiPo batteries, since they are being used more often now, e. g. DNA 200 mods. Brand new LiPo packs require a "break in" phase 8-10 discharges, and charges, in order to develop their full capacity. In addition, you want to discharge/charge at a low stress level. Compared to R/C Helicopters, you do more of a hover and simple flight, rather than full 3D flight. Therefore, for mods, try to avoid high wattage. In order to store LiPo packs for a longer time, they should be charged/discharged to 50%. In addition, don't discharge below 3.1-3.2V per cell. So, for a 3s LiPo, that would be 9.3-9.6V.
Another thing, although it shouldn't happen with a mod, LiPo packs don't like hard crashes. Some R/C Helicopters caught on fire, due to the LiPo, after a heavy crash.