There is next to no drain on the fan lipo. With that 900mah fully dead it usually takes a good hour to charge. After having that fan on for 15-20 minutes, it only took 4 minutes to top if off. Rather nice if you ask me. But I think my temp problem is because the pinion is too big. I just counted it and it's a 28T pinion. I wanna drop to a 19-21T.