Seller Quality Check Disclosure Some prior customer feedback has reported battery corrosion in unopened retail packaging of this model. To ensure a positive experience: The seller will personally check each Nano Light before shipment. A small slit will be made in the side or back of the packaging to inspect the batteries. The flashlight will then be placed back into its original packaging. The item is still new and unused—the slit is solely for inspection to guarantee a working, non-corroded product.