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Re: Will I get back my old kernel?
When you restore from a nandroid backup, you'll get whatever kernel that was running at the time you made the backup. But there's more to battery usage than just the kernel, although it is the kernel and not the ROM that sets the battery usage. I do use the Lean Kernel, and recommed it for lower battery usage, but in addition to using the Lean Kernel:
Originally Posted by junksecret
1. A lot of de-bloating using Titanium Backup. I have frozen a lot of apps that I don't use, including the Google Services Framework and Google Play Services. I haven't frozen Google Play Store, since I noticed that Titanium Backup uses it sometimes to check it's license. When I tried freezing the Play Store, Titanium Backup froze because it couldn't verify it's license. But I don't miss Google Services Framework or Play Services...I do manual syncs infrequently, and don't care about notification from apps, other than for text messages, of course. The only app that I have that misses these is Google Maps, and it does request Google Play Services, although I find that Google Maps runs fine without it. I do unfreeze the Google services framework and play services about once a week to get app updates *smile*. I hear that I wouldn't even need to do that if I got my apps from Amazon, but I'm not currently doing that. In the same spirit, I'm using Boomerang Mail instead of Gmail app, because I like the way that it refreshes email when I open it, and works well. That way I don't have to manually sync my email, Boomerang does it automatically when I want to use it.
2. Using greenify and the xposed framework for a hibernating a limited number of apps between uses...without that, they would continue to run in the background. At this point, I have only Google Maps, Google Play Store, Chrome, and Factory Mode greenified, which are apps that often seem to be running in the background. You can add apps as you figure out what's using up your battery by continuing to run in the background when you're not using it.
My idle battery usage is running about 1% per hour, which is fine with me. A couple of good tools to look at battery usage are "wakelock detector" and "betterbatterystats". These allow you to see how much deep sleep that your phone is getting; i.e. how much it is sleeping when idle, using less battery, as opposed to be held awake by particular apps. And they help you find out what apps are waking up your phone so that you can do something about it if you want to.