Bron, i know u mentioned that you're not going to root, but i assure you, the only REAL, effective way to play sts games for hours on a single charge is to root, underclock and use a battery saving governor.
The battery saver slider in sts mobile clients does help, but not too much as ur phone's max frequency it could run at is still the same(means at some point of time, especially in B*, ur phone would frequently clock itself to a much higher frequency due to demand-25 players in some B* bases.)
Lower frequency=better battery savings.
That's from my experience using a modified sgs III.
An alternative is that you can get a battery with a higher capacity(3000+MAH) if you don't want to root(maybe about $10+++ on Ebay?).
Sent from my ASUS Nexus 7 via Xparent Red Tapatalk 2
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