GPS and WiFi are two of the features available on most Android phones that eat up the most power, thus reducing your battery life. Aside from shutting off the display, disabling these radios when you don’t need them is probably one of the best things you can do to improve battery life — but remembering to disable the WiFi when you leave your house, office, or other trusted network can be a bit of a hassle.
That’s where Y5 Battery Saver comes in. This free app automatically determines your location based on GSM wireless towers, since your phone is pretty much always transmitting and receiving cellular data unless it’s in airplane mode. When you’re near a trusted WiFi hotspot, Y5 will turn on your WiFi, and when you wander away it will shut it off. It’s as simple as that.
Y5 requires you to turn on the WiFi the first time you want to connect to any network — or if it’s already on when you install Y5 Battery Saver, the app will add your currently connected network to its list.
Overall, Y5 is very similar to SmartWiFi, a BlackBerry app I mentioned a while back. The main difference is that SmartWiFi is a BlackBerry only app, while Y5 is designed for Android. Oh yeah, and SmartWiFi runs $5, while Y5 is free.
via reddit