The X645 is a 6 VDC lead acid battery; it comes with a BC-665 Charger and works specifically with the Bescor MX-600 and MX-601 dual lamp light housing.
Bescor - ATM-XR Automatic Shut-Off Battery Charger with RCA Connector
Price:$34.95
This item is usually Drop Shipped from the MFR/Distributor within 7-14 days (subject to availability). Your order will be charged at the time of placing the order with the MFR