[HTC One X] adi_ilie:
I have my HOX over an year now and this is my experience so far:

There are three elements to be taken into consideration when talking about battery life:

1. Hardware configuration;

2. Software

3. Type of usage

1.Hardware. I'm convinced beyiond doubt that the first batch of HOXs had faulty batteries or, ad least, ones of low quality. You know there are a lot of threads where people are complaining about battery overheating and low battery life. So: the battery was overheating (especially when gaming) the cores were hot and in this process, due to the fact that the heat was not well dissipated, the result was a lot of heat that leaded to extremly fast depletion of battery. This issue was gone with the introduction of HOX+ (with its 2100mAh battery). I don't know if the last batches of HOX have better quality batteries like the firsts ones. Basically, if the temeperature is not over 42-47 degrees (Celsius) when hard using, then the battery is good. If it reaches over 53-57 degrees then is one of low quality.

Solution to improve battery life

: change (at your own cost) the 1800mAh battery with the one of HOX+ (2100 mAh) -as I did, the cost for me was 35 Euro-.The big gain here will not come from the extra 300 mAh-but they are also welcomed-, but from the better quality of the battery that will not overheat so it will allow the phone to run colder (and smoother) and will not deplete so fast.

2.Software. Stock rom and kernell vs custom roms and kernells. ICS vs JB. Also a lot of disscusions here. To synthesize my personal experience and from what have I read: There are custom roms and kernells for performance and ones for battery life. Some are good, some are great and some..well still under development :p. Also: some phones are locked so they don't recive the updates so often and may have special issues. Stock rom and kernell are..somwhere in the middle. They are not bad for the battery life, but there are better ones. Also, various versions of android had different performances. For me, par example, with stock rom and kernell, ICS 4.0.3. was bad, 4.0.4. was GREAT, JB 4.1.1 until now was horrific, now is great. There is NO magic answer here.

Solution to improve battery life

: if you are rooted..then the solution is pretty simple: tray as much custom roms and kernells as you can until you find the perfect combination and remember that a rom builded for speed will not have great life battery life. For those with stock roms -like me- the solution are pretty limited. The one that changed my experience with my HOX and made it reliable again is -DISABLE GOOGLE NOW!- Yeah, those cards are cool, but: you have better weather widgets and animation already, the road to home or work will be shown the same in maps app if you need them and so on. If you use a wakelock detector app, like "Wakelock detector" :p or "Gsam battery" or "betterbattery stats" you will find out that most of the time "Network location provider" and other location wakelocks are keeping your phone awake and don't allow it to go to sleep. For me, in 15 h, before I disabled gogole now, my phone was like 8 h in deep sleep and 7 h awake. Now, it's 12 h in deep sleep and 3 h awake -and I have location turned on-. And, of course the battery autonomy is FAR FAR better. Also, there can be rogue apps or old ones that misbehave or corruped files that force your phone to stay awake and don't alow it to go into deep sleep. So I strongly advise that if you want to have a better battery life to do a full SD wipe -backup you data first :p- followed by a factory reset and install all apps from 0 and do not activate google now. You will be amazed by the outcome. But, I repeat, you must erase everything, including the internal SD, to be sure there are no bad apps or files left on your phone.

3.Personal usage.

]First of all: personal settings

: also here are a lot of threads opened and hundred of pages written so I will not insist so much. My personal setings are: Autobrightness, autosync (decent intervals of time not like at 5 min..), WiFi On all the time (with all those "smart" option enabled, from those for overnight to those for smart sync), Data Off (but with the widget on the scren to turn it on if necessary) and Network 2G only -to save battery life- (Not auto WCDMA/GSM, just GSM ONLY) If I don't have WiFi and I need fast internet, it takes like..10 sec to enter into menu and change the network to WCDMA/GSM Auto and hence to have 3G speed. Also: TASK killers are BAD! (there are a lot of threads about them if you don't trust me -so don't use them-). Battery improvers apps -mostly are not so great and in lot of cases they do much worse than good- a lot of users rely just on HOX's personal "Power saver" and I do the same if needed. Nothing more. Also BAD SIGNAL AREA is a problem that is not so well known, but, I can tell from my experience that, is the most important fact that is influencing your battery life. If the signal is bad (and probably will not even know it) the battery will deplete faster than you can imagine and will left you wondering what the heck just happened with your battery. I work in a building with a lot of concrete and steel interior walls and my signal is bad to almost none in 80% of the areas. The result is that I lose around 30% extra battery just for being at work.

Secondly: Personal type of usage

: Some are playing a lot or listening to music...other are just browsing..others are just casual users of the phone as a smartphone. It's obvious that if you play 2 hours you will not have the autonomy of one who's just browsing the internet and FB and just checking emails even if he's using the screen same time as you did.

Solution to improve battery life

: be aware of your settings and use them as you want and keep your phone as much as you can in an area with good signal. There's not much to be said.

In the end: I have latest stock JB and kernell (4.1.1.), my HOX is internal version and my settings are those of the above. After I have disabled Goggle now and fully wiped my SD and factory reseted my phone my stats are: with 21% left of my battery, I had around 2h of screen on and 1 day and 15 h of autonomy (If I wanted better stats I could record them into the morning, to have extra 7h of autonomy and just 2-3% lost overnight) The phone stayed in deepsleep for 1 day and 14 h and awake for just 4h and 30 min-so bad wakelocks are gone now-.

Sorry for my long post, but I felt that from time to time a post like this is needed. there are my stats attached.