so I just got my galaxy s3 on friday and already I'm having issues with it, I use to have an Iphone 4 and boyfriend still does. When i asked about the galaxy they said the battery is better then the iphone which is proving to not be true at all. My phone ( with barely any use at all, I literally had my data off for days) went down 77% and I repeat I barely used it. I used it in total maybe 2 hours. So it was all stand by and i had taken every advice online to turn the power saving modes on. Now, I personally think its unreasonable that when you buy a phone and it comes with LTE and I use WIFI at home that I have to keep turning it off just to have it work like a regular phone. The first time I charged my phone it took 2 hoursish. Now when I charge it I'm looking at 5-6 hours. That is absolutely insane!!! I'm plugging it in with the charger i got with the phone and I even turned my LTE off while it was charging, and I downloaded an app that someone recommended me called Battery Booster and it hasn't helped in fact I now get spam because of the app. I love the phone and whatnot but this is a huge deal breaker for me because the combination of having it die. I mean if i had to use it quite a bit someday I don't have time to charge it after 3 hours of use and have it sit and be plugged in for 5-6 hours. Does it sound like there is something wrong with the actual phone versus just normal behaviour? Cause quite frankly everyone i talked to about the phone said the battery life is great and this is worst then my iphone 4, and kind of the reason I wanted a different phone.
OK, there's a lot going on here. Instead of quoting every post in this thread, I'll just address this to everybody: 9+ times out of 10, task killing and "battery saving" apps really just to more harm than good. Not only do they generally only provide minimal actual battery life savings, but if you're a heavy user of your device, it can actually make things worse because your phone has to constantly restart apps that the task managers shut down...which takes more power than if they had just been left to be managed by Android as intended. These apps used to be almost 100% necessary, but honestly have been nothing but counterproductive since Gingerbread. I'm not going to bash every single product out there, because if you know what you're doing and the app is well written, I'm sure it is possible to optimize power consumption -- the point remains however that what the OP is experiencing is not normal, and to simply suggest installing power saver and task manager apps is (at best) only putting a band aid on a more serious issue. The OP is not asking "how can I improve the battery life of my phone?", but rather indicating that his/her phone is operating well below normal performance levels when it comes to battery life.
Now, to the OP's original question(s): I see it's been a while, so your problem may be solved, but a little more info may help...when you say it "went down 77%", what period of time are we talking about? When you're turning data off, it is mobile data, wifi, airplane mode?
Let's say that your phone is just idle,
but all data is turned on and nothing is disabled, about how long does the battery last? Does it drop several %/hour even when doing nothing?
Also, what do you mean by, "...that when you buy a phone and it comes with LTE and I use WIFI at home that I have to keep turning it off just to have it work like a regular phone"? which are you turning off, wifi or LTE...and why?!? What doesn't work if you do not do this? You
shouldn't have to turn off any data streams for stuff to work right.
Are you sure you're using the charger that came with the phone? Same plug and cable? 2 hours is probably about right if you're charging from a low battery, but I agree that 5-6 hours is way too long, and not normal.
For me, I never turn on any power saving features, keep data turned on all the time (but will use WIFI at home when I can), and usually when idle I lose anywhere from 2-5% per hour, which seems pretty normal. You shouldn't have to cripple your phone for it to work right. I have several friends with iPhones, and my S3 battery usually does outlast theirs, FWIW. If you're not going to be using the phone and REALLY want to keep it from draining power, just toggle on airplane mode.
If you can provide any additional info, we may be able to better pinpoint what's going on here, but either way, the first things I would do are (1) test other chargers to rule out hardware failure, (2), grab a battery monitor app to see if you can track down what's eating your power and see what kind of amps you're drawing while charging, and (3), as much of a pain in the @$$ as it can be, you find want to do a factory reset. If you have apps or system processes that have gone rogue and are eating up battery, a factory reset will usually take care of that.
Oh, and get rid of Battery Booster and any other task killer apps you have installed. If, once you get your device working normally, you want to try some out to see if they'll improve things for you, then fine, but until you figure out what's wrong, I would definitely not recommend running any of them.