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iPad Air Wi-Fi +セルラーモデル、モデル番号はA1475でスペースグレイかシルバーのカラーが選べ、容量は16/32/64/128 GBがあります。

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Battery issues with new battery.

Hi, recently I’ve got my hands on an old iPad Air first Gen with what I assumed was dead battery. It showed battery charging icon on screen on charger, but never charge enough to turn on. I've tried restarting the device, even dfu restore, but nothing worked. After some googling, I've tried restarting the iPad many times (about 30) when it finally came on. Coconut Battery showed me that the health of battery is 8%.

So I've ordered the new one. Exchange went good, even though it was difficult.

Imagine my surprise, when I've assembled the iPad and finded out, that new battery with about 30% won't charge, and that device would restart, when charger is connected (with charger disconnected, iPad won't restart by itself). It shows that it is charging, but it isn't.

Any ideas?

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There are a couple of possibilities here. The first one is that the replacement is bad…which is sadly, quite common. The other possibility is that there is more damage to the charging circuit, namely the charge port, Tristar IC or PMIC.

When troubleshooting charging issues, I would do the following (in order):

  1. Always try another Lightning cable and charger, preferably Apple original or MFi certified units.
  2. The Lightning cable 8-pin connector should be sitting flush with the housing and completely inserted. If it is not, there could be lint/dust/debris inside the port impeding a proper connection. You can clean it out with a toothpick, fine point tweezers or a dental pick. Just be careful not to damage the pins inside the Lightning Port.
  3. Change the battery. The battery is the weakest link in the entire phone and certainly for charger related issues. It is also the easiest thing to replace. Use a battery utility, such as coconutBattery (for Mac) or 3uTools (for Windows) to test the battery prior to removal. Anything less than 70% of design capacity will require replacement.
  4. If the battery is in good condition, you can use a USB Ammeter to determine if the phone is really drawing current when it says it's charging. If it isn't drawing current, then I would change the Lightning/Charge Port.
  5. If a new battery and charge port still don't resolve the issue, then you either have faulty replacement parts (possible) or a logic board issue. There is an IC (commonly referred to as Tristar) responsible for communicating with the charging device and uncertified chargers can damage it. Unplug the battery and connect a known-good (preferably Apple original or MFi) charger to the phone. A properly working phone will show an Apple logo and boot loop. If the Tristar IC is bad then the phone will not do anything.

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I thought about bad battery, but I unfortunately have no way to confirm that. I don't want to send battery back to supplier saing it's bad, when I'm not sure. Is there some other way to test it?

1. & 2. I've tried of course.

3. When using CoconutBattery with new battery it gets strange, sometimes it shows that health is 1%, sometimes 100%.

4. I've never done this, I'll try to find some YT video guideline to try.

5. I have no original battery to try on sadly.

Thanks for advices

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Petr Valčík さん、ありがとうございました!
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