Power On Board 3 Million Rechargeable Spotlight

We need a rechargeable battery for the Vector Power On Board 3 Million Candlepower Rechargeable sport spotlight-- any ideas where we could find one?

Vector is now owned by Black and Decker since 2006, you can order one at their website, you will need to enter the model #, here is the link http://www.dewaltservicenet.com/servicenet_home.aspx?AspxAutoDetectCookieSupport=1