Razor MX650 Rocket Electric Motocross Bike Compact electric motocross bike with powerful 650-watt electric motor Carries riders at speeds of up to 17 mph; authentic dirt bike frame geometry Dual suspension and riser handlebars deliver smooth, comfortable ride Pneumatic knobby tires for maximum power transfer; quiet variable-speed, chain-driven motor Recommended for ages 16 and older (220-pound weight limit); 90-day warranty . Initial charge time: 12 hours.Failure to recharge the battery at least once a month may result in a battery that will no longer accept a charge.