A larger option that doubles as a lantern by sliding the head up. Camping or long-term power outages.
Because this technology is specialized, you will often find these under "emergency" or "survival" categories. Aqua Flash Water Powered Flashlight buy water powered flashlight
If you need high-power lighting for modern use, consider these high-rated "water-resistant" traditional flashlights instead: Does The Hydralight Flashlight Really Work? A larger option that doubles as a lantern
You dip the "fuel cell" in water for 10–15 seconds to activate it. buy water powered flashlight
Mixed; some testers found the light "pathetic" and much weaker than standard Maglites.