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you lift this bag of rocks a few feet, once, and get half an hour of light. No storage like batteries or supercaps to replace. I too have an LED flashlight. It drains and goes out after a couple of minutes now that the battery is a little older, and it takes a considerable effort (100-200 turns of the crank) to fully charge it. If as promised, this is much better. (on rereading, quite an endorsement - I wish to assure you I have no connection to the inventors)