![What is this hole on my es4? Just got my es4 today. What is the hole on the front? The charging is from the external battery I thought. : r/ninebot What is this hole on my es4? Just got my es4 today. What is the hole on the front? The charging is from the external battery I thought. : r/ninebot](https://i.redd.it/xj8z7jihylt41.jpg)
What is this hole on my es4? Just got my es4 today. What is the hole on the front? The charging is from the external battery I thought. : r/ninebot
![EU STOCK Original Ninebot Upgrade Extra Battery for ES1 ES2 ES4 E22 E22E E22D Kickscooter Skateboard External 187Wh Battery Kits|Electric Bicycle Battery| - AliExpress EU STOCK Original Ninebot Upgrade Extra Battery for ES1 ES2 ES4 E22 E22E E22D Kickscooter Skateboard External 187Wh Battery Kits|Electric Bicycle Battery| - AliExpress](https://ae01.alicdn.com/kf/Ha0f7e6d5c4f4467695ccb80a4e5379987.jpg)
EU STOCK Original Ninebot Upgrade Extra Battery for ES1 ES2 ES4 E22 E22E E22D Kickscooter Skateboard External 187Wh Battery Kits|Electric Bicycle Battery| - AliExpress
![EU STOCK Original Ninebot Upgrade Extra Battery for ES1 ES2 ES4 E22 E22E E22D Kickscooter Skateboard External 187Wh Battery Kits|Electric Bicycle Battery| - AliExpress EU STOCK Original Ninebot Upgrade Extra Battery for ES1 ES2 ES4 E22 E22E E22D Kickscooter Skateboard External 187Wh Battery Kits|Electric Bicycle Battery| - AliExpress](https://ae01.alicdn.com/kf/Hfce5678fa1cd40a7a0af3426ec5a8174s.jpg)