This is my fourth ordered ThruNite and the third the dead on arrival. Lamp does not function, neither with original ThruNite 18650 batteries, even with other high-quality 18650 battery. (The batteries work fine in other lamps) This is already the second 2C v2 succession which is not at all easy. I'm sorry, but the quality looks different. And that goes back Postwendend back - my last ThruNite product.