Check out the new version 1.1.0, now it can work with just wifi scanning to find your location.
I would type in 2-3 network SSIDs you can usually see as sometimes the scan will miss some networks. Nothing I can do about that easily, I think pretty much every wifi device has that issue.
Anyways, if you use that and disable the nokia positioning methods entirely, there should only be tiny battery impact.
The SSID is not case sensitive, but you have to type the whole thing for each one you want it to match. If it sees ANY of them, the condition is satisfied.