I think there is hardly a sector where so many fantasy data is printed on as the Li-Po batteries in model, well maybe the lumen values in the flashlight sector. 2500mAh I get at least not out. In 1700-1800mAh is final. This value can be but my Parrotdrone fly almost 20min and so I am considering the price but then satisfied. I bought 3 pieces that have the same values therefore not an isolated case (Monday Battery). The larger sizes fit, but the Velcro is at the limit.
Anyone who wants to increase its flight performance massively which I can recommend the batteries.