[HTC One X] Shan89:
Heres the tip for everyone that use some market apps for battery saving like *juice defender* *battery saver* etc , well guess what you're all wrong , think a little bit before reading comments or believing in the stars of the app. Yes they do reduce your usage by cutting off wi-fi/ bluetooth / GPS etc etc , but hey that is ALL also manually do-able and for those who flash roms / mods/ tweeks theres STOCK jb hox battery saver which you can MODIFY exactly to what those market apps do and more , except this is already running all the time in the background and aint wasting battery, but those apps that you download from the marked ARE using your BATTERY and RAM which leads to worse overall performance as well the BATTERY.

TASK-KILLERS: This is even WORSE then battery saving apps. and here is WHY : For instence some task killer kills apps when your phone lets say have 50 ram free and needs to release some more RAM since thats what you made it do. Now put it this way:

Lets say browser uses 20 ram

Call&phonbook 20 ram

Settings 40 ram

and gallery 20 ram

So we have 100 ram used in the background right (btw this is not how much they use i just made an example lol ) anyway if the phone has 50 free RAM left for usage it will kill some apps in this example lets say it kills those apps i wrote above. Now your phone have 150 free RAM , now when you want to use next time call&phonebook and other apps listed above and YOU WILL since they're one of the most common stuff you use what will happen ? Well BATTERY DRAIN , and heres why : if those apps were running in the background all the time they wouldn't use literally any battery , but if they got killed and restarted that would make your device raise CPU freqs onto higher freqs and LOAD the APP all over again ( which would also lead into slower opening of those apps ,but if they were opened in the background it would be almost instantlly ) So if we use task-killers all the time this would make our devices use even more battery then what it is already. Besides if you don't kill apps that are most commonly used your phone will be faster thx to the background process and multitasking. Besides hox has AVARAGE 250 free ram on JB which is MORE then we actually need. So trust me you don't want to kill most used apps , kill apps that you use once a day or so.

As for battery life theres MANY settings how to increase your battery life , mainly try using less your mobile network that is the killer for battery and relay mostly on wifi network , avoid using GPS unless necessary , use avarage 25-30% brigness ( don't use auto brightness ) , wifi off when you sleep ( you can set that in wifi settings ) auto sync , disable it when you sleep as well. Use power saver unless you're gaming and you should have AVARAGe 3:30-4hrs screen time. My personal max screen on time was 7hrs 31min in overall usage of 36hrs auto sync and wifi on the whole time. It's all about how do you use your phone and which settings. It depends alot on the rom and kernel as well. And we still don't have good kernels for battery, soon as we get the source battery should increase at least 40-60mins at screen on time.

Btw avoid apps that are constantly checking your phones status etc. like apps for monitoring cpu , thats barly letting your phone to go in the deep sleep. Think a little bit what that app actually does except looking *pretty and innocent* before you download it :P

Sorry for the long post , If you not lazy read this and understand , i hope it helps you out =) Cheers !