Chrome hits the battery pretty hard on my Nexus 7: ~20%/hr of surfing (this is the actual amount the battery indicator runs down).
Also updates will use quite a lot. So for example when it recently updated to Android 4.4.3 and a bunch of apps followed up over the next 3-4 days, running down the battery about double expected.
Leaving the wifi on overnight will use about ~5 -10% even when otherwise doing nothing.
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"the corruption of power may be bad, but the corruption of powerlessness is worse.'"
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