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  • CM12 is good for battery life generally, but if the kernel isn't properly optimised for your device, you won't get much better perf/battery life.
    Which is actually surprising on a Nex5, i'd have expected proper kernel support. When I was still using CM12, I would add a good 50% battery by underclocking and undervolting while choosing the right CPU Governor. it takes a lot of tinkering to get it right though.

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