I think mine might be torn. I heard some rattling when first unpacking, although the rattling is gone. In any case, the battery does not "click" (wirelessly) and remains locked in the inflator. It works when I hold it and seems to inflate the tires very quickly. Used to inflate the front left car wheel when warned it is a little low, also used to inflate 4 bike tires. Looks like it still has some charge. But it's very difficult to hold the battery while trying to maneuver this thing on the tire. I tried to contact the seller the day I received it but he didn't reply. Unfortunately I threw the box away but I'm still tempted to request a refund.R