Sunpak TR-3000 Power Pack

With a 2500 mAh Li-ion battery and two power ports, the TR-3000 Power Pack from Sunpak can operate up to two HV flash units, such as the 120J II. This battery pack both lengthens runtime of the flash and improves recycle time to 1 second at full power. Also, for control it has a simple on/off switch and four LEDs to check current status. Additionally, it comes with a carrying case with belt clip and a shoulder strap.