The Fenix ARB-L18-3500U battery can be charged via its own USB port and a charger.
Recommended chargers: Fenix ARE-D1, Fenix ARE-D2, Fenix ARE-A2, Fenix ARE-A4 smart charger
A protection circuit is integrated into the anode and covered with a riveted steel cover.
The battery is completely covered by the steel shell, so the potential risk of short-circuiting caused by collision or impact is extremely low.