By far the best power option for your AA powered flashlight would be a set of eneloops. It is still useful however to keep a pack of ready-to-use cells in case of an emergency. The Energizer L91BP-8 Ultimate Lithium AA is one powerful alternative designed especially for use in digital cameras but just as efficient in your AA flashlight. It is however important to note that the Energizer Lithium AA batteries are not rechargeable. Even though they carry the name ‘Lithium’, the Energizer Lithium AA batteries are different from the commonly known ‘Lithium-ion’ rechargeable batteries since they are single-use batteries (Not rechargeable like Li-ion) and the terminal voltage for each cell is around 1.65V (compared to around 3.7V for each Li-ion rechargeable cell). So, if you are seeking to acquire one power solution for your camera and EDC you can check out this pack of eight Lithium cells.