Sort:  

the one I saw with batts had 3x 4AH and 1x 6AH, but the link I provided is 2x 9AH for $206 and the run times for the PPS would be a lot longer. $412 is a lot of fiat but it is immense back-up power.

The new DW lineup is pretty impressive!

I got a literal crap-ton of Li-Ions when Radio Shack shut down, like 32x on the 26650 cells, I need to build a back up power pack with that, I think ;)

yup...I would.
there are u-toob video's about folks doing that very thing.

A spot welder is much better than soldering on to the end plates of the cells, (as many U-TooberZ do) I am thinking HARD about getting one ;) I think my retirement job is going to be Battery Tech Deluxe :D