Earthwise Survivor says that the Acebeam TAC2AA is the brightest flashlight powered by AA batteries. The Acebeam TAC 2AA is a versatile flashlight powered by a rechargeable li-ion battery or 2 AA batteries. It boasts a high-output LED capable of reaching 1600 lumens and offers two modes: daily mode with 5 brightness levels and strobe, and tactical mode with direct access to turbo. The dual button interface allows for easy operation, while the lockout mode and battery indicator enhance safety and convenience. The included pocket clip ensures secure carry.