I can't figure out how to insert the batteries. カスタマーセンター October 25, 2017 08:21 Updated Follow Please open the cover on the top of the NinjaLock by pulling the catch. Insert the batteries in the correct position. Related articles How long is the battery life? How can I check the remaining battery life? Will I need an electronic socket nearby? How long is the warranty period? Comments 0 comments Please sign in to leave a comment.