So our power is not exactly real reliable at my house. Since February, I have lost count how many times the power has gone out and came right back on (10 times on one particular evening alone) and it has gone completely out for several hours on 2 occasions. So I wanted some way to charge my cell phone, and power other USB type devices. I had bought a power pack but it MIGHT charge the phone once before the battery was dead and forget about it powering a small fan all night.
Then the thought occured to me, why not add a USB outlet to my Ryobi flashlight? It uses the standard Ryobi 18 volt battery, and I have a couple of the higher capacity lithium ion batteries. Not to mention, I have a car charger now to recharge the 18 volt batteries. Perfect!
So I went on to Ebay and bought a dual USB 9v/12v/24v/36v to 5V DC-DC 3 amp Step Down Power Module.
I added a small switch to be able to turn this module on or off independant of the flashlight, then proceeded to open the Ryobi P704 flashlight and wire things up. Here is the end result;
So far I have charged my cell phone twice on the same battery. I want to see how many times I can recharge it before the 18 volt battery needs to be recharged. After that I will hook up one of the small USB fans to it and see if it will run all night on the small 18 volt battery before trying the extra capacity battery.