Cup very efficient borders. However, I regret that the battery takes "only 20 to 25 minutes." Too bad, because this cutting edge is recommended! Too bad also that the price of a 2nd battery is 2/3 the price of the device, nearly 100 euros while the trimmer is 149 euros! spot the mistake! the excessive margin on the battery would make us buy a second device! I therefore expect a significant drop in the cost of the battery! For this second reason I put only 3 stars so that the product would have deserved 5!