French researchers have announced a prototype of an 18650 sodium-ion battery. If you’ve bought a powerful LED flashlight, a rechargeable battery pack, or a–ahem–stronger than usual LASER ...

This model contains a high quality rechargeable 2600mAh 18650 battery. The R20 Javelot charges through a Micro-USB port on the side of the flashlight. The R20 Javelot is your perfect companion for ...

For the first time ever, a battery has been developed using sodium ions rather than lithium ions in the industry standard "18650" format used in laptop batteries, LED flashlights and the Tesla ...

Rather than rebuild a battery pack, I'm going to discuss a couple of options for re-using the individual 18650 cells. I recently disassembled a dead pack and set about determining which cells were ...