Fresh lithium batteries have a slightly higher voltage and less internal resistance than alkalines, so they'll allow more voltage to reach the LEDs, which means nice bright light—while it lasts!

This high-quality LED flashlight is compact, measuring just under 6 inches and weighing only 2.6 ounces, yet it packs a ...

Today we are having a look at the Acebeam Rider RX flashlight. The flashlight is designed to be the ultimate everyday carry and comes with a wide range of features and a unique design. Acebeam was ...

Two is one; one is none. This is a military axiom that is heard and repeated during any preparation for an operation. Given that 80% of the data we humans use to make decisions comes to us through our ...

Posts from this author will be added to your daily email digest and your homepage feed. is a former senior reviewer who worked at The Verge from 2011 until May 2025. His coverage areas included audio, ...

The Duracell Coppertop Duralock AA Alkaline is part of the Batteries test program at Consumer Reports. In our lab tests, AA batteries models like the Coppertop Duralock AA Alkaline are rated on ...

You may have heard that LED flashlights using AA lithium batteries run hotter and die sooner. Is there any truth to this? The short answer: There could be an issue ...