How to properly use iphone 5s battery performance

Will my iphone 5s battery performance still be at maximum (full performance and capacity) if I charge it at any percent like 57%? I always thought charging it any time will weaken the battery life so i'll have to charge it more frequently as time goes by.
Also, is charging my iphone 5s in the car and/or through a computer the same thing as charging through an outlet?

JCHAAAANG wrote:
Also, is charging my iphone 5s in the car and/or through a computer the same thing as charging through an outlet?
No. The iPhone wall adapter supplies 1 amp. Most computers and built-in car usb ports only supply 1/2 amp. So it will take twice as long to charge using those. And, if the iPhone is actively being used (such as using it as a GPS in a car) it won't charge at all, because the battery will be draining as fast as it is charging.
You can get higher current adapters for cars (I just got an InCase 2.4 amp car adapter yesterday at an Apple store), and some newer computers can supply 1 amp (including all Macs since 2011). There is no iPhone benefit to an adapter that supplies more than 1 amp because the charging circuit in the phone limits the charge rate to 5 watts (1 amp @ 5 volts). An iPad, however, can use up to 2.1 amps (12 watts).

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I recommend this part of the article iPhone: Hardware troubleshooting found here http://support.apple.com/kb/TS2802.
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Connect iPhone to iTunes and restore iPhone.
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P.s sorry for my english.

How to properly use iphone 5s battery performance

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