Refurbished Segway Ninebot External Battery for ES1, ES2 & ES4 and Bird ES-1 | eBay
Original Built-in Battery Parts For Ninebot Kickscooter Es1 Es2 Es3 Es4 E22 E25 Electric Scooter Internal Battery Accessories - Scooter Parts & Accessories - AliExpress
Original Inner Battery for NINEBOT KickScooter ES1 ES2 ES4 – E-Scooter UAE Hub
Here is the only way to finally solve ES2/ES4 external battery connector issues once and for all. : r/ninebot
Battery Ninebot Kickscooter Es1 Es2 | Ninebot Es2 Extra Battery Es4 - 100% New 36v - Aliexpress