Battery pack has 2 connectors. So you do not need to worry about the correct connector. Check all pictures to see both connectors. You simply need to use one which is right for you. Nothing more. Fold spare connector into the battery compartment and start using your robot. Renew your battery and get more power from your robot. Give your electronic pet new life. 2800mAh Much more powerful than original battery. Make Sure your robot has RVBAT850 Battery pack. Other batteries packs have different connector.