High quality rechargeable flashlights are available in polymer and anodized aluminum. Some feature convenient USB charging. Rechargeable flashlights powered by Lithium Ion batteries will generally be brighter and more lightweight. When choosing the best rechargeable flashlight for your needs, be sure to compare lumen output and beam range. For example, a high lumen flashlight with a beam range under 800 feet signifies a wide beam. Also a small pocket-sized flashlight will have a shorter beam range than a larger model. This is due to the size and depth of the reflector.