Where can I find the serial number? 14 September 2021 09:47 Updated Answer: The serial number is at the back of the box. The attached picture illustrates the location of the serial number. Related articles Can I get an extended warranty? What is the warranty policy? How to test if a jump starter can work after receiving it HULKMAN Alpha Jump Starter User Manual What's the difference between Alpha 85 / Alpha 85S / Alpha 100? Comments 0 comments Please sign in to leave a comment.