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