Anyone seen this yet? A bit bulky but looks like a neat solution, especially if you already have the required batteries. Seems to be 1.5A total output from both ports combined, not 1.5A from each output.
http://www.amazon.com/DEWALT-DCB090-12V-Power-Source/dp/B00EYSUK7W#productDetails
(http://ecx.images-amazon.com/images/I/41phkv-vzjL.jpg)