Ninebot ESx External Battery Adapter

This handy adapter allows you to easily wire an internal battery into the external battery port of any Ninebot ES model scooter. As described in our [Ninebot Modular Battery Mount](https://www.thingiverse.com/thing:3702069) post, the cylindrical internal batteries are cheaper than the official pod shaped external batteries even though they have the same capacity. They are therefore a great option for an external battery (modular or otherwise) on a budget.

Don't own a 3D printer? [Purchase a Ninebot ESx External Battery Adapter](https://www.bananascience.net/product-page/ninebot-esx-external-battery-adapter-kit) to help support our future projects.

Our early testing suggested that internal batteries couldn't be wired into the official external battery port so we simply wired our modular external batteries in parallel with the internal one. As many have pointed out, this was questionably safe due to the large voltage difference between the two batteries. **Our latest tests have pr