"We ordered this rechargeable battery because we needed to be able to adjust the speed and we are pleased with that aspect of the battery. HOWEVER, it does not come with a charger! And not only that, you HAVE to use the correct charger from Lego...which is an extra $30...that comes to $80 in order to use this battery pack. This is the first time we've been disappointed by a product from Lego. It came charged so we got to play with it for a bit, but we won't be able to recharge it until we order the charger which will be awhile so now the battery is useless."