I have the big brother to this model taking two of the big-ass $20 batteries! Build quality and function is unparalleled. It is amazing and overkill and you would need to see a doctor if someone shone it in your face!! Still seeing spots... I am on board with this drop. PS. Waterproof...? Not quite. IPX-8 standard is--I think--waterproof at 2 metres. Don't leave it in the hot tub or store it in the pool!