Make sure you set the backlight to auto or off. I'd turn off wifi and you can also turn off GLONAS under gps settings.
I've got one of these, the battery life is terrible
Bought this on the £110 Amazon deal. If you are looking for turn by turn navigation, you might want to look for a higher spec model as this is quite basic for that.
Also no power meter support if that's important to anyone.
2 points of note for the Garmin Edge Explore ; No Live Strava segments and no Garmin Virtual Partner. Both I find useful when cycling so now have the Edge 1000 (previously had Edge 130, then 520).