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Released September 25, 2015. Model A1688/A1633. Repair of this device is similar to previous generations, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, 64, or 128 GB / Silver, Gold, Space Gray, or Rose Gold options.

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How reliable is battery health/capacity number?

how reliable is the IOS battery health figure? here's why i ask. i have a "for parts" iphone 6s that wouldn't turn on. after futzing around with a couple of DFU restores and a new battery, i was able to get it running. the battery i pulled out was a 3rd party, and i confirmed with the seller that it was newly replaced (yeah, took that with a grain of salt).
when i put that battery into a good iphone frame, charged it up for 24 hours and it powered up. the battery health showed 100%. within 10 minutes it dropped to 80%, then down to 2% within 5 more. i power cycled the phone and it went to that battery frame with a sliver of red and the "plug me in" animation. checked the next day and it was at 100% charge, unplugged the power cord and it dropped to 1% within minutes.
do batteries just do this? even though IOS says that it can take a 100% charge, can the battery still be crap and not hold a charge?
does the battery health really take into account the battery's ability or is it based on some other factor?

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in most cases it is quite good but sometimes it isn’t. for example in iOS 11 battery health was still in beta so it isn’t an good as say iOS 12. Also companies can change what the phone says by taking old batteries and reprogramming them so it looks like it is new, and the is quite a common thing on eBay with sellers with really cheap prices. Also sometimes the phone just can’t really get the battery health right. a good battery measuring tool for iPhone and iPad that works really well on computers too is called coconut battery

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B C zal eeuwig dankbaar zijn.

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