I get about 5 days of battery life on 3 wicks a day (15 uses if you do the math.) Then it goes back to 1 light bar and I fill up. At first I thought we left the switch on between the lights, but it just stops when it's all off. In an emergency, do not rely on it! I suspect USB has the benefit of using a rechargeable battery for backup, but look elsewhere for something with better battery life. 2 stars because it technically works, but I don't get 500+ bulbs out of the battery as written.
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