Batteries and Charging
I was looking for some LiFePO4 18650 cells to replace the dead NiCDs in a Ryobi 18V portable drill, and I found some 2500 mWh NiZn AA cells for $32 for 16 pieces.
http://www.ebay.com/itm/16-pcs-2500mWh-1-6V-Volt-AA-2A-NiZn-Rechargeable-Battery-PowerGenix-/151256251587
This works out to about...