backpacking rechargeable led flashlight Camping Lights FLY2SKY 2Pcs White Tent Lights Mini Portable Camping Lantern Survival Gear Camping Accessories for Hiking Fishing Hurricane Emergency Outage : Sports & Outdoors so you can see how much charge the battery has at any point 4-Pack Rechargeable Zoomable LED Flashlights

And you can see here the difference in a regular 26650 and Olights

Package content Cinlinso is a company specializing in flashlights, committed to researching advanced and innovative lighting technology

Charge to 100% 2.5 hours

Lets take a quick look at the specifications between models: Fenix TK35 Flashlight Cree XM-L2 U2 Model Output: 900-15 lumens Run time: 1.75-140 hours Battery type: 2 x 18650 lithium-ion rechargeable or 4 x CR123 lithium Beam distance: 1,246 feet (380 meters) Peak beam intensity: 36,100 candela Fenix TK35 Flashlight Cree XM-L U2 Model Output: 860-15 lumens Run time: 1.62 hours-130 hours Battery type: 2 x 18650 lithium-ion rechargeable or 4 x CR123 lithium Beam distance: 1,115 feet (340 meters) Peak beam intensity: 29,000 candela So it looks like the Cree XM-L2 U2 LED gives you more intensity (higher candela rating), longer beam distance, and slightly longer run times

If you want a small AAA that just works, this is the one

Duracell Coppertop reliable emergency choice Duracell Coppertop provides consistent voltage for low-to-medium drain LED flashlights and is commonly used in disaster preparedness kits