Carry Rechargeable Power. The SFRCR123 is a lithium-ion protected RCR123 battery with USB charge capability. This allows the user to conveniently charge the battery using any USB power source such as a USB wall charger, computer/laptop, power bank, or automotive USB port, using the included USB-A to USB-C cable. Additionally, an external RCR123 compatible CC-CV cradle charger (not included) can be used to charge the battery; possibly at a faster rate if so equipped. High-performance 3.6V RCR123 lithium-ion rechargeable battery with USB port for ease of charging - no charging cradle needed When plugged into a power source, the LED indicator displays the current charge state: Red for charging and Green for fully charged 900 mAh capacity ensures plenty of power to drive compatible high-performance products 8-10A discharge rate for dependability in high-drain devices such as LED flashlights