The TASER Performance Power Magazine is a lithium energy cell power supply system. It has an extension to provide a larger grip, but it does not hold an extra cartridge. Battery Features: X1: Approximately 500 5-second trigger-initiated firings X26P: Approximately 500 5-second trigger-initiated firings X2: Approximately 250 5-second ARC switch-initiated firings Device Compatibility: X1 X2 X26P TASER is a trademark of Axon Enterprise, Inc., registered in the U.S. and other countries.