Rip open the 9V casing with some pliers and retrieve the ‘AAAA’ battery cells, which will fit in most AAA battery slots (remote control etc). C to D Cell Grab those C Cells and throw them in your device with a few extra quarters. This will make up for their smaller size while carrying the power. 9 volt to AAA conversion (Video) – [MetaCafe] Quick hack: The $1 C-to-D adapter – [EvilMadScientist] Via – [Hackzine]
