Here's a quick hack that will multiply the uses of your 18vdc Ryobi flashlight. I've added a 12vdc output for charging my ipod or cell phone in a pinch. It took about a hour and wasn't too difficult. Check it out.
1-Ryobi 18vdc Flashlight model P700 (Home Depot approx. $13)
1-7812 12vdc Regulator (Radio Shack approx. $2.00)
1-Bell 12vdc Power Clip Adapter (Advanced Auto approx. $6.00)
6" of red and black wire (you can use the extra wire from the power clip or some old speaker wire)
3- 1/2" lengths of heat shrink tubing (Radio Shack)
1-18vdc Ryobi Rechargeable Battery (you should already have this)
1-5vdc Power Adapter for Ipod or cell phone (you should already have this)
1- Drill and 1/4" bit
1-Roll of solder
1-Heat Gun (to shrink the heat shrink tubing, or you can use a match-be careful!!)
Step 1: 2 Uses in 1
Here's the finished hack. The handle is tall enough to add the 12vdc socket and still use the flashlight. It will help in a pinch to charge low powered devices like my ipod and cell phone.
IMPORTANT: The regulator used has a 1 amp limit so pay attention to how many amps you device requires.
IMPORTANT: You need to use a 12vdc to 5 vdc adapter to charge the smaller devices, you probably already have these in you car anyway!
Step 2: 12vdc Out
I drilled a 1/4" hole where shown so I wouldn't be bothered with the wire when using the flashlight. The socket is zip tied to the base as shown. Make sure to hot glue the wires in the hole.
Step 3: 12 VDC Regulator
Here's the packaging for the 7812 regulator I bought at Radio Shack for about $2.00. Make sure you pay attention to the connection points as shown on the back of the package.
Step 4: Wire It Up!
Here's a drawing I made to try and explain the circuit. It's added as a parallel one and uses the regulator to reduce the voltage from 18vdc to 12 vdc. Hopefully you figure out all the parts of the light.