I'm bumming. My ext. Batt died last week. Before that my phone would last 2 days on a single charge.. now I'm barely lucky to do a few hours of heavy use. Ext battery is sold out everywhere.
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I have pretty much had the extended battery since launch, and it goes through weird cycles of lasting long and not lasting so good. My trick is to always charge at night when I'm asleep followed by resetting battery stats every week and doing them nice full charge. Always make sure to charge using a 850 miliamp charger or better (or you will wait forever). The stock charger is a 1amp charger.
I get at least a good sixteen hours of very heavy LTE usage. I'm running a stock kernel with virusrom.