The Green Sound 2200mAh Lumia Edition is another advanced battery design based on the original Green Sound. They have applied the highest quality varnish to the outer surface, making it brilliantly bright, tactile and soft to the touch. The improved, modified connection is finished using a one-step forming process. It is the strongest replaceable 510 thread battery ever created! Therefore, you will never experience any problems of breakage involving the top connection port.