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After exiting the applications on my Galaxy nexus, they appear on the recent applications list. Do they still use CPU/battery? Do I have to remove them from recent applications list in order to save battery?

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The recent applications list show only what applications have been recently used, it doesn't check whether they're still running or using memory/CPU. Therefore, this list doesn't affect battery use one way or the other.

Instead, you might want to check Settings -> Apps -> [swipe to the right] to show running applications, processes and services. Here you can see the apps that are using your device and consuming battery, and kill unnecessary processes by tapping the app and then Stop.

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What's about cached processes? Do they still use CPU/memory? Should I end them as well? – user1014639 Nov 27 '12 at 14:20
Android does a really good job at managing its own memory; there's generally no reason for you to micromanage it. It's only in cases of a poorly-designed app or a stuck process that you even want to bother. – Al Everett Nov 27 '12 at 14:22

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