I've not been looking really! But it'll be relatively low, hence the big estimate. Truth be told, one of the previous builds (3.2.5?) Made my phone run hot for like 3 days straight and it never really recovered. Was considering sending it back for repair arguing that the update ruined the battery life significantly, but now that it's being more efficient whilst it's idle I'm in two minds as I think they'll just send it straight back to me.