AndyMark used to sell that (or a similar) charger, but I can't find it on their website right now. It had the Anderson connector already installed, which is important for charging FRC batteries. If you buy this one from Amazon, you can buy the connector separately and install it yourself.
Helmar sells the connector housing with crimp contacts:
www.helmarparts.com/product_p/6331g2.htm
That's with #10/12 contacts, which work well on the charger side (not for installation on battery or robot).