The ALF-18 battery adapter allows you to use an 18650 battery in flashlights that are built to use a 21700 battery. Simply insert your 18650 battery into the holder and place both into your 21700 capable flashlight. Made with copper plated contact, providing excellent conductivity performance. Compatible with button top as well as flat top 18650 batteries. Specifications Size: Length: 2.4″ (61.2mm) Diameter: 0.85″ (21.5mm) Weight: 0.2 oz. (6.1g) Material: PC- ABS materials Copper plated positive contact Compatible with: HT18, TK22 V2.0, TK22 UE, PD36R, PD40R
