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A light emitting diode (LED) is a semiconductor device that emits visible light when electrical current passes through it, it is a special kind of diode.
Keep the batteries in your flashlight when it's not in use-that way, you'll have a working flashlight when you need it. If you don't use your flashlight for a long period, turn the power switch on and off occasionally, just to make sure the flashlight is still working. It's also a good idea to change batteries periodically to prevent battery leakage if you don't use the flashlight for long periods.
If you use your flashlight frequently, change the batteries when the beam starts to go dim. If your flashlight is used just a few times a year, we recommend changing the batteries occasionally to prevent leakage due to aging. An alkaline battery has a 7-year shelf life and can be used for years when maintained properly.