My battery is not strong again from 50to 2 percent
Having problems with my phone battery from 50to 10percent
iPhone 6s Plus
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Hello,
Start here:
Check the charging port for lint or other debris (use a bright light and a toothpick).
If your iPhone, iPad, or iPod touch won‘t charge
Next, check the battery health:
iPhone Battery and Performance
Lastly, consider a battery replacement:
Good luck.