These are rebuilt batteries .  You are buying only one battery.  You will have no issues with the battery that you can take to the bank.  

I have tested each and every battery so you should have no issues.

The three interfaces for charging/discharging and data are exactly the same. Truly plug and play.

These batteries can last 900 plus cycles and I have capacity tested them. I only use high-capacity LG or Samsung Cell.

I have a workshop devoted to rebuilding these batteries. I had some new ones, but they are all sold.

You will not get any error message on your display you have my word on it. Not plug and pray.

These batteries will not work properly with any other devices as they are custom made for Segway/Ninebot G30.

I stress test each battery pack by installing it in my Nineboot Max and riding it at full throttle for 30 minutes on free wheel. So you can be sure you are getting an awesome battery. No one on Amazon or Ali Express does that aggressive of testing.

Return accepted with 30 days. I’m that confident. No questions asked.