2s lipo is for LED's only, so yes typo. Pulse 6600 is a 4s. I wight them, the local shop sells them, they are called anti-gravity. Whether they are truly 5kmAh...??? C rating is 35c. Its just very odd that a 4s 6600 hovers fine, 2x 3s 6600 of less wight, or lets say the same won't.
The 15amp...