Warning Not Responsible To Any Damage Done To Your Device! This thread is suppose to help make your Galaxy S2 4G or any other device you might have in your possession at a chance for longer battery life throughout the day without having to carry a charger with you all the time to keep that device running. The Guide To Better Battery Life: What causes the phone to drain battery? -Processors -Large displayed -LCD -GSM, HSDPA, Wi-fi and GPS -Usage style Note: Need to be rooted to download some apps. What are ways I can solve my battery issue? Types of applications you will need to download from the Android Market ( Google Play) Step 1: Greenify ( free/Paid ) Description of the application: Greenify help you identify and put the bad behaving apps into hibernation when you are not using them, to stop them from lagging your device and leeching the battery, in an unique way! They can do nothing without explicit launch by you or other apps, while still preserving full functionality when running in foreground, similar to iOS apps! ROOT is required. - Pick the applications on your device that you want to be put into hibernation mode when you are not using them. - Should begin to notice better battery life on your device because the application that was always idling in the background is now in deep sleep mode meaning the battery should be lasting much longer. Step 2: Battery Doctor ( Free) App Description for Battery Doctor: With One-tap power saving, battery doctor can offer customized power-saving suggestions according to your battery juice consumption. It can also give you an estimate time of usage with the current battery level you have. Moreover it would also let you know the different power usage for different activities you do on your Android device. I manage to run this app on two of my Galaxy S2 4G's and the battery length doesn't seem to disappoint. Step 3: Turn off all location services ( Battery will increase when doing this.) Step 4: Turn off the motion features in settings ( Battery will increase when doing this.) Step 5: Change Screen Display (Battery Doctor changes your display for you to get the best battery life out of your battery) Quick Tip for brightness: - Lower brightness down instead of using the automatic brightness because the device uses sensors to detect rather or the not how bright it should be indoors or outdoors. ( Step 6: Turn off bluetooth/GPS/Sync ( Battery Doctor will all changes these settings for you to get the best battery life out of your battery) Step 8: Run Battery Calibration ( Optional) Step 9: (Optional) Buy 2200/3200/3800mAh extended battery Step 10: (Optional) Midnight Rom (Optimize phone for maximum battery life) -recovery needed (backups/restores) - Ability to know how to install a custom rom Overclocking ( Included in Midnight Rom) also helps with getting better battery life when underclocking device. Note: Device may become unstable when underclocking device. The Battery Data: 1. Galaxy S2 4G - Battery Usage - 13 hours Day 1 - 12 hours - Light Use Day 2 - 13 hours/14 hours - Heavy Use 2. Galaxy S2 4G - Battery Usage - 21 hours Extreme Use (Highest) Day 1: 21 hours - Heavy Use Day 2: unknown -White Device (Lasting Longer now) -Black Device ( Device is lasting longer everyday) Note: Sorry about the second image size being so big. Post pictures of the two devices battery data later on.