The pack came from harbor freight on sale for 15 bucks, and for 15 cells at 1500mA that's pretty good. Whether these are long lasting quality cells or whether they crap out before long we'll have to wait and see, but it's worth a shot. Stock DeWalt packs have 2000mA cells, so this is only 75% the original runtime, but for most things around a hackerspace it's suitable.
Anyway, As you can see from the photos, I opened both packs, removed their cell "cores", cut the new cells into 7 pairs with a dremel, then imitated the original cells layout, soldered desoldering wick where I needed connections, and salvaged the casing, screws, thermistor, and connector from the original pack. For the cell connection on the front end of the pack I used a peice of springy nickel coated steel from an RC car's controller switch as the negative cell's contact didn't have a tab to solder to and soldering to rechargeable batteries is not a good idea and difficult even if you try.
The sharpie marks across the tops of the cells are more just as a reminder and guide while you solder your wick tabs in place, but aren't needed. If you have any questions feel free to ask!