Fenix has taken a leap in battery technology by unveiling its new high-capacity 21700 rechargeable batteries, now available for purchase. These cutting-edge power cells boast an impressive 21.6 Wh capacity (equivalent to 6,000 mAh at 3.6 volts), delivering more energy to cater to the ever-growing demands of modern devices. Even though these batteries are slightly bulkier than their predecessors, the benefits they bring outweigh this minor adjustment.
At the recent IWA 2025 event in Germany, Fenix expanded its lineup beyond the well-known 18650 models by introducing the ARB-L21-6000 batteries. This new model triples the capacity of its predecessors, which were rated at 14.4Wh/4,000 mAh. While the current model lacks a USB Type-C port—a feature found in the dual-variety 18650 versions—Fenix has hinted that a USB-C compatible version is on the horizon. This upcoming model will incorporate necessary charging hardware, causing a marginal increase in length.
Durability is a key attribute of these batteries. According to Fenix, after 500 charge cycles, users can expect the battery to maintain 75% of its original capacity. This speaks volumes about their longevity and reliability. The new 21700 batteries are slightly heavier than previous versions, weighing in at 2.8 ounces and measuring 0.87 x 3.02 inches. The increased size is minimal when compared to the advantages of longer-lasting power.
Compatibility shouldn’t pose an issue for those invested in other Fenix products. The ARB-L21-6000 is specifically designed to power models like the Fenix TK22R, HT18R, HT32, PD40R V3.0, PD36R V2.0, and LD45R. For those considering these batteries for alternative uses, it’s advisable to ensure proper measurements are taken before proceeding.
Fenix’s move into the 21700 market comes later than some competitors, yet promises to deliver comparable performance. Priced at $24.95 each, these batteries match the cost of the brand’s previous 5000mAh models, offering customers greater value with their enhanced capacity.
This launch underlines Fenix’s commitment to advancing its battery technology while focusing on delivering quality and durability. Shoppers can find these new powerhouses on the Fenix official online store and capitalize on their enhanced energy solutions.
