Best answer I have heard is WIFI is normally the better option. 2g/3g/4g is a constant up and down draw with signal strength and have always heard that this will pull more from the battery over a consistent WIFI connection.
there is no clear answer on this forum .. any ideas?
It all depends on the signal strength. If you are in an area where 3G signal is good but a weak wifi signal, wifi will use more energy to remain connected. And also, if wifi signal is full and 3G signal is weak, using wifi will yield better battery life. If both signals are robust, then using wifi will effectively use less energy if you are using you phone actively. If you are a passive user who is not streaming media or chatting or anything else that needs you to be connected, then you should stick with 3g as the radio turns off after a few seconds non usage. Wifi on the other hand remains on. So effectively uses more battery for passive users. Hope that helps.
I don't know anything tecnical to tell you, but I can give you real life experiences. I got my RAZR on 12/31/11 and for the first week and a half I had it set to use 3G. By the end of the day I only had 30% to 40% battery. Last week I changed it ot use wi-fi wherever possible. Right now at 4:55 PM I still have 80% battery and I have used it all day for checking and replying to e-mails and I have noticed several app updates throughout the day.
My daughter who uses her Droid 2 Global to play around on FaceBook and Twitter, for what seems like all day, also changed to wi-fi and she has 40-50% when she goes to bed where she was dying around 7-8 pm with 3G.
My own personal experience using Wifi and home and at work... then turning my wifi off, going with full LTE... then going to 3G only... so I've done it all testing different ROMs. I definitely think, and have seen, Wifi is the best on battery life no matter what ROM I'm running.
I have the Razr and I can tell you that WiFi is your best solution for battery hands down. 2G/3G/4G consumes alot more power. Plus, WiFi also helps with data if you you don't an an older unlimited plan(obviously). It is the best way to conserve for any smartphone period. I leave WiFi on in my house all day for all my phones( Razr,Thunderbolt, Galaxy Nexus and Galaxy S 2 ATT). This is a factt opinion and not speculation I hope this helps. Live It, Love It, Android-Life!
i agree, wi-fi saves more power. i use "y5 battery saver" from the market which automatically turns on my wi-fi in places where i have connected to a wi-fi network. its greats cause it will turn off your w-fi automatically when you leave your wi-fi spot so your battery isn't waster searching for a signal.
In my experience, WiFi is a lot better for battery life. I have my phone set up so that when WiFi is connected, my mobile data switches to 2G. I also have the sleep policy for WiFi set to "Never." Works incredibly well, assuming you have decent WiFi signal.
All of the 3rd party people trying to pull data from your phone while it is on. Turn it all off; add most of your apps to the auto end list except the ones that have to be on like your music play if you are listing to music or Pandora while you are listing to music...when done add back to the auto end list. Things like GPS can be turned off. Turn it on when you need directions, then when you get there add it back to the auto end list. My data 3g is always on...at the end of the day I'm at 70%...in the evening I'm online reading stuff, bringing it down to 40%-50%. besides what I mentioned above, the screen being on drains most of your battery.