This charger is just like an eGo/eGo-T/eGo-C USB Wire Charger, but the threaded post sticks out a bit further from the casing so that it easily makes contact with the x6 battery post.  This charger can also be used with any standard eGo style battery, but it is required for the x6 and x7 batteries

This charger can ONLY be used with X6, X7, eGo, eGo-T, and eGo-C Batteries. Using any other battery with this charger will cause damage to your equipment and is a fire Hazard.

X6 USB Charger output is 420mah