As has been suggested, looks like you'll need a USB battery power pack (The kind you can plug your cell phone into charge. I recommend a +14,000 mah power pack).Well yesterday I ran this on some AA rechargeables, after 7 hours they were almost dead. I am going to have to rethink this project.
That is EXACTLY what I am planning on doing... Setting them up to log the active frequencies of a couple of businesses.As long as you don't place the scanners on private property I wouldn't worry about it. What I WOULD worry about is the equipment getting stolen.
We have a couple of local businesses which appear to use two way radios but no "official" record can be found of which frequencies they use. They are both located in areas where sitting around in the car is not really possible / a good idea.lol. What are you even trying to intercept?