My battery hasn’t been charging fully fast nowadays
My battery won’t charge fast it’s on %89 in battery life what’s going on?
iPhone 12 Pro Max, iOS 15
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Are you using the MagSafe Battery Pack?
If yes, check this:
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Note: By default, charging is limited to 90 percent to optimize the lifespan of MagSafe Battery Pack. To remove the charging limit, open Control Center, tap Low Power Mode, then tap Charge past 90%.
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copied from: MagSafe chargers and battery packs for iPhone - Apple Support