... lead-acid battery 2)good qualtiy 3)CE certificate electric bicycle conversion kitsIt is easy to install on most of bikes ... , motor controller, smart charger, battery level indicator, brake handles, twist throttle, bracket, battery bag. Hub motor: 24V or 36V, 180-350W, DC, brushless, quiet ... Option:Battery: 12v, 12ah, lead acid sealedBattery case: Plastic electric bicycle conversion kits