Product highlights
The Fenix ARB-L21-5500U is a 5500mAh rechargeable 21700 Li-ion battery with a built-in USB Type-C port, so you can charge it directly from any standard USB adapter without a separate battery charger. A full charge takes about 3 hours at 5V/2A.
It delivers up to 10A of continuous output for steady, long runtimes in high-output Fenix lights, with excellent thermal performance to avoid overheating. Multiple layers of protection keep it safe: a built-in protection circuit in the positive terminal, a pressure relief valve, steel casing protection at the negative terminal, and flame-retardant materials. It is rated for 500 charge cycles and keeps up to 75% of its original capacity after 500 full cycles when properly maintained.
Compatible with the TK21R, HT18R V2.0, HT32R, PD40R V3.0, PD36R V2.0, and other Fenix lights that use a 21700 battery. It can also be charged in a Fenix ARE-X1 V2.0, ARE-D2, ARE-D1, ARE-A2, or ARE-A4 charger. Price is for one battery.
Shipping note: Lithium-ion batteries are classified as dangerous goods under US transportation rules and usually ship by ground only, so orders containing loose batteries often take longer to arrive than the standard estimate. Delivery times of 14+ days are common.
