About the battery usage on your iPhone, iPad and iPod touch – Apple Support (UK)
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Original Apple iPhone Xr Battery Rechargeable Lithium Ion Polymer Battery/ Cellphone Mobile Phone Smart Phone Li Ion Lipo Batteries - China Mobile Phone Batteries and Phone Battery price | Made-in-China.com
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iPhone 11 Pro Max Battery Replacement UK - FreeFusion
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Apple overstating iPhone battery life claims: UK consumer advocacy group | The News Minute
Apple cuts cost of iPhone battery as it apologises over performance