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Re: "Eye" icon in notifications - Smart Stay?
OK. First off, you're doing some things here that are not necessary and/or bad. You don't need to turn off mobile data when you are connected to WiFi. That happens automatically, so you're just wasting your time. The exception to this, is if you have the WiFi set to go to sleep. DO NOT "CLEAR YOUR TASK MANAGER". This has become a massive pet peeve. Apps stay loaded in memory so that they can use *less* resouces next time you want to use them. Many apps, such as those that sync, will have to relaunch themselves to perform that sync. This means that, by constantly force closing them, you're actually making them chew up far more battery by relaunching than they were by just sitting there idle. And that's not even getting into the stability issues you can create.
Originally Posted by parthrawat
It's important to understand that, in Android, apps stay loaded in memory, but that doesn't mean that they are running. That's not to say that there can't be an app that was written badly that doesn't properly sleep and *could* drain your battery. In that instance, uninstall that app and give it the bad review it deserves in the Play Store, since handling this event is simple and there's no excuse for an app to be doing it incorrectly. Personally, I use an app called "System Panel" for that sort of thing. It works much more like "Task Manager" for Windows, in that you can see from the main list *which* app(s) is using the CPU by a small, vertical gray bar on the left edge of each item in the list.. It will also indicate the apps' actual status: "active", "idle", "cached", "service" or "system".
Now, for the battery drain, go to the settings menu, and then "Battery" and it will show you what apps have been using the most battery. Now, so long as you have been force closing everything, this might be misleading as you will likely see a bunch of system apps eating a lot of power because they keep having to relaunch. At the top, where is says "1h 40m 40s on battery" (or whatever time) click on that, and it will give you details on how much your screen has been on, and whether the phone has been prevented from "sleeping". This is indicated by the "Awake" bar at the bottom of that second screen.
There are actually a couple of things here to take note of: the awake time. If it's solid, you've got a bad app that's killing your phone. Also look at the "Mobile Network Signal" bar. If it's solid red, this means you're in a low signal area, which will rapidly drain your battery as the phone (desperately) searches for a better signal.
Also, if you're connected to WiFi at night, make sure that your WiFi isn't set to "sleep". To do this, go into settings, then WiFi, then hit the "Menu" button and select "Advanced" from the menu. There are a couple of settings here, actually. Personally, I *always* uncheck the "Network notification" option. This means that the WiFi scans every 5 minutes or so for an "open" WiFi in your area and notifies you if it finds one. Depends on how much of your day you spend going from place to place and how important it is to know if there's an open WiFi in the area, I guess. Also, if you turn off that notification option, set the "Keep WiFi on durring sleep" to "always". I know that having the WiFi chip "sleep" along with the phone sounds like a great idea, but these devices *want* to be connected to the internet so, as soon as the WiFi cuts out, the cellular radio turns back on and that uses significantly more power than WiFi.
I suspect your problem is going to be either a rogue app or the cellular signal strength. Personally, I leave WiFi, Bluetooth and GPS on 24/7 and I get 12-15 hours of battery life, easily, with moderate usage on my Note 2.