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new phone soon first charge question

The full charge and discharge is all about the phones ability to accuratly read the battery. The phone determine when to charge and stop charging so yes a good full charge and discharge will extend battery cycle. Its not the battery but the phone meter.
Go ahead and play while charging, no harm unless you do it for hours and then you will feel it get very hot. It it gets hot ,let it sit for a few minutes to cool off by not working the cpu.
 
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