Battery iPhone 6s
The battery on my iphone6s quickly loses its charge once it getss down to 20%. I didn't realize that this is a common problem. I would like a new battery for my phone.
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iPhone Battery Replacement - Official Apple Support
Most everything closed depending on where you live...maybe send for repair...see link above...
Avoid waiting for an appointment or traveling to a store. We can send you a box right away to collect your iPhone. Arrange a shipment to an Apple Repair Center and we’ll replace your battery and deliver your iPhone back to you in 3-5 business days.