I have no idea if this makes that big of a difference or not, but had mine about a month now, and buddy at the store told me to let it go from 100% to completely dead about once a month to keep it strong. I just did it the other day and the battery already seems a little better than it did last week. Just sayin'..
With my S1 I was terrible for plugging it in at 45-50%, within a year it was junk, wouldn't last 3hrs. I try to never charge it unless its almost dead now, usually under 10%.
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