ipad air 4 battery

nuttawut128 Said:

"ipad air 4 battery: I want to know if it's normal I charged the battery at 100 percent, but I haven't used it for about 20 days ( just put it ), but the battery dropped to 29 percent. Is that normal?"

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Instantaneous Battery Percentage Dropping:

No. That is not normal. I'd say it was not powered off and you got some notifications that popped up, or the Battery Health is way down (in which case it's time for a new battery)

Look Up the Battery Health:

When the Battery Health is 80% or lower, it is time for a new battery.

1. Go To: Settings
2. Tap: Battery
3. Tap: Battery Health
4. View: Percentage

Time for a New Battery?

If your iPad was not fully shut-down, but simply left in its “sleeping” state for 20 days, then the iPad has done remarkably well to still have 29% charge. When ‘sleeping”, background tasks will continue, this consuming power.

If instead you had fully shut-down the iPad, then the iPad battery will gradually lose some charge over time. The iPad is never totally powered-off - as the clock is still running. Additionally, all batteries will gradually lose some charge due a phenomenon known as self-discharge.

Assuming that you had fully shut-down your iPad, then there are two possibilities…

1) The shut-down was incomplete. This would result in higher than expected loss of charge.

2) Your iPad or its battery has a fault - or the battery is approaching the end of its usable lifespan.

You might attempt to test this yourself by fully recharging your iPad, shutting down, then leaving your iPad undisturbed for a few days:

Turn iPad on or off - Apple Support

When you next check, if the battery has only lost a few percent of its charge, then (1) above is perhaps the likely. If instead the battery has lost a considerable chunk of its capacity, then (2) is more likely - indicating that battery service or more thorough diagnostics may be required.

If you have any concerns, you might be best advised to seek assistance from Apple Support - and request a remote diagnostic test. You can contact the Support Team using the Get Support link at top-right of this page. Alternatively, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:

https://apps.apple.com/gb/app/apple-support/id1130498044

You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad:

Genius Bar Reservation and Apple Support Options - Apple