buy more will cheap wholesale 18650 battery 1200mAh 3.7V brand new a full capacity matching internal resistance voltage Hongli - AliExpress
Amazon.com: TDHLW 48V 20AH 18650Cell Electric Bike Lithium Battery with Matching 3A Charger, Ebike Battery Pack for Motor Folding Electric Bicycle Built-in Lithium Battery,Silver,48v20ah : Sports & Outdoors