Product Reviews

Reminder: This article discusses techniques for rappelling, which inherently involve significant risks. Improper use can lead to serious injury or death. Always ensure you are proficient in these techniques through professional instruction and rigorous practice before attempting them in a real-world climbing environment. The information provided herein is for educational purposes only and should not be considered a substitute for professional guidance. Being an avid climber, I am always trying to perfect my kit. One piece of gear that I’ve never settled is the rappel extension. This article is meant to catalog the extensions I’ve trialed. I’m not going to try to discuss the merits or drawbacks of extending a rappel, nor will I provide an extensive list of options; alpinesavvy.com has a great article that goes into more detail. ...

I recently found myself with a large supply of 217001 Li-ion cells and no specific application in mind. I figured that you would probably be able to use them to charge a phone in some capacity so I went looking for a power bank that had a user-replaceable battery. I didn’t come across many options. Nitecore advertised an option that used a 21700 cell, but some quick research indicated the cell was not user-replaceable. Nitecore also offers an option that uses their proprietary 21700 battery that has the anode and cathode on the top of the cell, enabling some very lightweight options, but doesn’t help me with a use case for the 21700 cells I already have.