For original battery I can then recommend only the original charger, which also has its price. And best equal also the also quite expensive manual for programming learning. Finally got me all this while cost a lot of money, this also (buy Robo, Robo built, powered by batteries and failed program ...) in the wrong order. But the bottom line is everything is now available with me, as a last resort now the book to the robot and thus had annoying one end and the real fun went out and stops. Unfortunately, late, because you get the right advice is always too late. That's why I write this here - appropriate advice in advance.
By the way: the Netgear does not work with the Mindstorms, even though it is often bought with this. I got this error also made. I act now via Bluetooth and it works.
It is precisely this information, I would have liked even before buying, there was not. That's why I hope that this one is helpful to other buyers.
