A Flashlight Fenix E20 V2 ($40)The Fenix E20 V2 is my top pick for an affordable emergency flashlight, but the ThruNite Archer 2A V3 ($30) is another solid choice. At 350 and 500 lumens, respectively, they're bright enough while remaining compact, and last long on lower-light settings—200 hours at 5 lumens for the Fenix and 51 hours at 17 lumens for the ThruNite. Both use two AA batteries, and in an emergency, your main concern is to have a steady supply of replacement batteries.
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If you're using alkaline batteries, remove them from the flashlight if it's going to sit unused for a long time, otherwise they'll leak and cause problems. Still, store them near the flashlight so you can easily find them. Try taping the batteries to the flashlight barrel.
Pro Tip: The best-performing flashlights are built specifically to use lithium-ion batteries or have non-removable rechargeable batteries, which won't do you any good if your power is out for days. Rechargeable NiMH (nickel metal hydride) AA batteries hold a charge longer than disposable alkalines, so buy some Panasonic Eneloops ($39). They're better for the environment, but if they run out of a charge you can still use regular alkaline AAs.A LanternColeman Divide+ Push Lantern ($22)