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Post-jailbreaking troubleshooting

XYZ 

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My battery life is bad after jailbreaking, what can I do about it?

There are various reasons that battery drain can increase after jailbreaking, with various fixes.


Personal Hotspot/MyWi: Sharing your 3G connection to other devices is a massive battery drain, and if you've just updated to 4.3, you may well be trying out this new feature. Not recommended for long term use without a power source for your iPhone. At least it's got an easy fix--just turn it off.
Simple increased usage: This happens mostly to new users who've never jailbroken before. With all the new things you can do on a jailbroken device, combined with the time spent getting everything set up the way you want it, you're simply using the device far more than you might think. If this is the case, then after a few days, your battery life will come back a bit closer to normal.
Faulty config: Some apps may not be quite configured correctly after the jailbreak, Mail is often a culprit here--it attempts to connect to a mail server, fails in an unexpected way, and simply keeps trying again. So instead of Mail making one connction every 30 minutes (or whatever), it's continually trying to connect. You can test this one by disabling all your email accounts then restart and watch what happens. Fixing this can soemtimes require deleting and re-adding the email account, or sometimes even simply re-saving what you've got.
Faulty apps: It often takes some time for apps to be updated to the latest version of iOS. Most of the time, this isn't a problem--apps either work, or they don't, but sometimes they can have adverse affects such as significantly increased battery use. To find out if this is the case, try disabling or not using specific apps for a few hours, then turn them back on and compare the battery drain. This can be a slow process, but may be the only way to find the culprit. If you manage to find one, you can leave it disabled short term to stop the battery drain, and contact the developer to see if they're working on an update.
Heavy-duty apps: There are always going to be some apps that simply use a lot of CPU/battery. Video wallpapers, animated lockscreens, live clock icons, and so on. It may not be a huge amount of battery use, but it can definitely add up. If you're finding that these apps are draining your battery, you need to decide for yourself whether they're worth it for you.
The Jailbreak: Sometimes it can indeed be the jailbreak process itself which results in the increased battery usage. While the devs try their best, they don't always have access to every possible iOS device model, or may miss some weird bug. If you've tried the above investigation without success, and are still getting huge battery drain even in Safe Mode, no apps running, Mail disabled, and the phone sitting unused for hours, then it could well be the jailbreak at fault. Fixing this may be as simple as a restore and re-jailbreak, or you may be out of luck for your device, and the jailbreak that you're using simply won't work well with your device. If this happens, you might want to try a different jailbreak method, or ask on here, making sure to specify what steps you've taken to reach this point!
 
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