The ARB-L16-700U includes a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. This battery can quickly be charged without the need for a separate charger. This not only saves you money from purchasing a charger, but you now have no need to carry around another piece of equipment with you. Simply plug the USB cord directly into the battery. A micro-USB charging cord is NOT included.
This battery has been discontinued. Please see the ARB-L16-700UP
They worked great
Good design choice with the charger built in sadly a very poor performing battery.
I am getting about 30% of the expected run time with these batteries.
Buy many because you'll be swapping them often.
I have asked warranty to reach out to you to trouble shoot.
I love my Fenix headlamp as it is light, dependable, and bright. Highest recommendation.
Wish it were USB-C, but nonetheless reliable, fits the HM50R V2.0, convenient, and reliable.