Good protected 18650 with usb-c, alternative to sl-b26 - Nitecore NL1836R 3600mAh USB-C Rechargeable 18650 Battery

Compared to SL-B26, this is about 3 mm longer and has 38% higher rated capacity. Works in Streamlight HL-X Pro although it is a tight fit. Charging over USB-C works, including with C-C cable.

This protected cell is rated for 6A max and is significantly longer than a standard 18650. It would not be appropriate for a lot of devices that need a standard size or high output 18650.