Made for the FJ400 AC/DC flash head, the removable Lithium-Ion Polymer Battery for FJ400 AC/DC Strobe from Westcott is a 14.8V, 4400mAh, 65Wh power source that will give you 480 full power flashes on a 2.5-hour charge. The battery has convenient LED charge status indicators and weighs 1.5 lb.
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Spent a lot of money switching over to these lights and batteries. I have a lot of regret too.
I bought the battery as addition to my FJ 400 strobes. No more separate battery packs requiring cords. Outperforms my expectations.