I have a fairly new Samsung Note 2 phone running Android v4.1.2. One day I noticed that the battery was draining much more quickly than usual. (It usually lasts over two full days without a charge but recently it didn't even make it through one day.)
I went to Settings->Battery and it showed that Gmail was using 80% of the battery. This is weird because it's usually the screen or Android OS that consumes all the battery.
In the Gmail app, I also noticed that it was constantly refreshing on the lower right.
Google searching led me here, which recommended going to Settings->Application manager->All->GMail and clicking "Clear data". It was previously using several GB (I didn't record the exact amount) but after clearing, it was back down to ~13MB. Pre-clearing, the cache was also several GB and after it was ~2MB.
Clearing the data solved my problem.
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