You know I was actually thinking about the guy who was the originator of this thread earlier and was wondering if he was still reading this stuff or not. Question answered I guess
But now here's another question I had in the same thought.... what does this feller really want? Does he simply want his battery to last longer? Is he looking for more control over his system? Im not too sure but I had some [what I think are] reasonable things to say on either fork in the path.
Perhaps the problem is just in the misunderstandings about battery life in general. I was upset by my battery when I first switched to a smartphone. I went from a device that would run for literally days on one charge to something that (once again literally) jailed me to the seat next to the outlet at home. Werent cellular phones designed for mobility I thought? When I delved into it I found that the average battery has the capacity of about 3-5 AAA batteries. Now can you imagine how long youd be able to run your disc man ( i know old school right) on 3-5 AAA? A few hours at the most. Now add in a digital camera, cellular phone, game system and all other functions available in modern hardware. Certainly we are in an age of miracles! This is alot of things eating at the small amount of power in the battery though I can still understand why a person would want to squeeze maximum life from thier battery though, so in light of that shared interest I will suggest simple things like tuning the screen timeout on your device, setting app sync options to their minumum and other such things. Even with all that being done battery life is still dismal, but as others have tried to explain, Android and the apps it is running are not to blame. I found this out early in the game by trying to use a disk defragmentation app. It was exactly like everyone has said.... I had a performance issue, then I hit the defrag button and saw an immediate increase.... but wait! minutes later the problem was back and worse! I had to go for that button again and again. Research I did suggested exactly what this thread is saying. Android takes care of itself. it does not need user maintenance. I stopped trying to improve my performance by that method and looked into what was good for android and had better results.
Perhaps more control over your device is what you would like though? Perhaps (as is the case with that OS that starts with a big W...hat the hell) you should decide what is running and what should not to get optimal performance, with a focus on your battery life. Enter the panacea of the battery apps. Unfortunately you cannot judge Android by other OS standards. I am completely astounded by its ability take care of everything that needs to be done for folks that dont know how, as well as leaving teh door open for the tech knowledge advanced as well. Basically I havent seen a damn thing that android cant do if you ask it right. Dinking around with the core workings never works though.
If youd like to improve your experience, look to custom roms, and slimming bloatware from your device (VASTLY improves performance and battery life) and after that look to finding an app that HAS what you need rather than an app to DO something for you. If you want a camera that behaves in a specific way, it probably exists. But if you want to get an app to make your other apps behave in a way that you want, instead of the way the system intended..... thats where the trouble starts. Like so many others have said, let Android do its job and your will be happy with it. If your battery isnt up to snuff, then (if you're still willing to try another android) make your next purchase with that in mind. Large capacity for a battery is currently (I think ) around 2300-2300 mAh and will have the longest life. As to answering your question ("how do you kill ____ app") I dont know, because I dont kill em. If I have a problem I restart my device and let it get a fresh start with all its resources intact
I hope this helps