I recently replaced the original battery in old Silverlit ferrari with a 18650 cell. The performance was very good, after about an hour of driving around the room the car stopped moving,
Amazon.com: HAWK'S WORK 3.7V 300 mAh Lipo Battery, 1S 20C Lithium Battery with USB Charging Cable for Toys RC Plane Truck Boat Quadcopter Helicopter Drone (B) : Toys & Games
Las mejores ofertas en Silverlit electrónico, baterÃa y Juguetes de cuerda | eBay
Amazon.com: HAWK'S WORK 3.7V 300 mAh Lipo Battery, 1S 20C Lithium Battery with USB Charging Cable for Toys RC Plane Truck Boat Quadcopter Helicopter Drone (A) : Toys & Games