Note: Model versions can be determined based on the product ID code on your Razor product. The Drifter Go Kart 19-digit ID can be found on the rectangular white sticker underneath the frame, on the battery cover, or on the original battery charger. The 7th and 8th numbers in your product ID code are the version number of your Razor product (e.g. "01" = Version 1, "02" = Version 2, "09" = Version 9, etc.).