Did you actually launch Maps, or did it randomly eat your battery? Something similar happened on my N7 a couple days ago--I had my GPS off, and I hadn't launched Maps in probably weeks, but it randomly started eating my battery. I didn't notice until it was at 30%, but it had somehow kept my device awake the entire time. Either I accidentally launched the app (buried in a folder in a drawer), or it was--like someone else suggested--Google Now. Though, my device is wifi-only. Since forcing Maps to stop, I haven't had a problem since.