The Flashpoint Battery Power Pack Unit for the XPLOR 600Pro TTL Monolight is a impressive internal and interchangeable high energy 28.8-volt Lithium Ion 2600mAh battery, capable of over 370 full power flash bursts on a single charge, with the extra energy to oblige the powerful LED modeling lamp. The battery module snaps quickly and securely in place on the rear of the XPLOR 600Pro. The battery recharge is a snap, too, using the external power charger to reach full capacity in approximately 2 hours. Keep the action going without tying up the flash to re-energize. Exchange a depleted bat-pack in a matter of seconds to keep pace with whatever you're tracking. Recharging is accomplished directly to the DC port on the battery so you can stay in the shoot with a fresh unit while the exhausted power pack is charging. The power status level of the battery is clearly displayed on a series of color coded LED s, whether on or off the monolight. With several in your monolight's case, you can fire away without fear of losing the XPLOR advantage..