I'd like to make an IP cam battery powered. (or at least see if it's feasible). It currently is powered by a 5v power supply. Info on it says 5vlts @ 1.5a. I don't mind changing the battery(s) once a month or so,,,of course longer the better but how big of a battery am I looking at? Or how many? (ish). And I'm assuming it would need to be a 6v battery so nothing else is in the burning power....? Thanks!