[Galaxy S III Q&A, Help & Troubleshooting] KeesStolk:
Here i will post stuff that comes along the road like question about batterystats at recovery.

We used to have a option to wipe the battery stats at recovery, also there are some tools at Play store that claims to give a better battery life by just wiping those stats.

But after reading this excellent article, it comes clear that wiping those stats are bull.

So i am glad that option isn't available anymore and perhaps in time, the questions about those stats will faint away in oblivion :)

And another one i like to share.

Fast Dormancy.

Here is a great article about it, made by Erica.

For me, my provider is saying it's not supporting FD, but when use the method to check, it is supported.

So i tested it for a few days on and off and found that when it's off, i do get some better battery life, but it's just minor.

Instead of losing 5% battery at 8 hours standby, i lost 6%.

Also, i didn't see any benefits in speeds, so i turn it off every time after a flash of a new rom using gokhanmoral tool.

Another thing i like to add.

Wifi.

I have seen many posts about wifi problems.

Here what always works for me.

Sometimes just a reboot of the router will help.

Also, i find changing from dynamic (default) to static that my connection is faster connecting to my router (always use the never setting at wifi advanced to save battery).

Here is how to do it the easy way.

First set it up using it with the default dynamic settings, this way all will be filled in for you.

To change it to static.

Long press your connection and choose modify network config and check show advanced options.

Scroll down a bit and tap on IP settings and choose Static.

And that is all, now you have changed it to static and there is no more need for ip adress to negotiation any more.

https://www.google.nl/search?q=wifi...s=org.mozilla:en-US:official&client=firefox-a

Also if still having problems, adding some more permissions can solve it.

I use root explorer for this

ETC > Long press wifi folder and choose permissions (remember to change Mount R/W to Mount R/O) and check all nine boxes.

Hit back and go to Data > Misc and again long press wifi folder and again, check all nine boxes.

Space

I know, i am a control freak and i hate it when i see space just vanish.

So did some search and found a thumbnail map with more then 1gb size.

Looked at some submaps and i only saw some old stuff.

So, selected all the submaps and just deleted it without problems and gain more then a gb free space.

Here is where you can find it using root explorer:

storage > sdcard0 > .thumbnails.

Edit:

As bigmo7 pointed out, the thumbnails will be rebuild, but off course not off stuff that isn't present on the S3 anymore.

So, if you are someone that is just making pictures or making / creating movies and never delete then from your S3, there is no point off deleting the thumbnails.

But if you like me, moving, creating copying and deleting this kind off stuff, then you can gain space.

Battery life

Always a hot item.

First all, the S3 is a mini computer and computers need juice, just remember this.

Here are some stuff i always do after flashing a new rom.

If the rom comes with a aroma installer which let you select stuff to install or not install, look careful to the list.

Stuff you don't use, can just eat resources and i myself, just find it a waste.

Next, after flashing and setting up the new rom, you will be presented with the option to use wifi.

I always go to advanced when making a wifi connection to choose Never when phone is in standby.

For me, but this can be different for you, wifi is a bit off a drainer so do some testing, let it run overnight with Always selected and another night with Never and see the difference.

Next you will be present if you want to restore and let google backup your phone.

I always deselect backup my phone, first reason, i am a control freak and i decide when and what i want to backup.

And second it can give you wakelocks and this will cost you battery life.

Next step i do is going into settings and to sounds, i don't like the clicking sounds and i deselect all the system sounds.

Next, location services and deselect GPS and Location and Google search.

I want GPS active only when i need it, some apps like Facebook will activate GPS when running and i don't like this.

And i don't want Google to know where i am all the time.

Some weather apps needs Location and Google search to determine your location, but i use Weather pro and it don't need it.

Next step is going into accounts and look what you have selected for syncing.

I always deselect Google photos, Internet and Picasa web albums.

Stuff i don't need :).

Location settings at accounts is also off.

Next step is using the Fast Dormancy toggle to disable Fast Dormancy, although my provider is supporting it, enabled costs me a little more juice. Although it's minor, but a lot off minors things makes it bigger :).

Then starting Playstore and at settings, deselect Notifications.

And finally freeze stuff i don't use with Titanium Backup pro.

http://xdaforums.com/showpost.php?p=31576747&postcount=105

All this, is giving me a great battery life, with screen on time between 4 1/2 to 6 1/2 hours, depends what i am doing.

And with the latest JB roms, 1 to 2% battery los in 7 hours standby.

No need for me to toggle Airplane mode, mobiledata or some other powersaving setting or app.

I am also always running the stock insecure kernel that comes with the rom, for me no need for a custom one.