powered by single AA or 14500 More Convenient With Cree top class XPL-HD LED(50000-hour lifespan), LUMINTOP Tool AA 2.0 could pump out up to non-diminishing 650-lumens brightness which only runs with a single 14500 cell. In the evolved internal circuit, the power consumption rate further decreases, and it can continuously light up to 37 hours maximum in the Low mode.. Also, Tool AA 2.0 can support both Ni-MH AA and Alkaline AA. It boasts up to 270 lumens of brightness and runtime of up to 60 hours with just AA.