Re: Initail phone battery charge.
Personally I charge to 100% run until about 40% then charge to 100% and use normally.
Regardless of my battery life I always charge overnight and in the 2 years I have had my s4 I have noticed no determination in the life or longevity of the battery.
Don't charge via USB as the amperage is to low to charge the battery within any amount of time, 2A at home and I use a 4A car charger.
Obviously this is my preference be it right or wrong.
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