iPad battery health issue after 4 months of use

Many factors can impact your iPad's reported battery health. Limiting the overall number of charge cycles is only one factor. Restricting battery charging to 80% of maximum can indeed reduce chemical aging, however, this only reduces the aging aspects caused by maintaining the battery at 100% for extended periods.

Observed battery health will not necessarily reduce at a linear rate determined by charge cycles alone - however, you should anticipate that the indicated health will reduce by at least 1% for each 50 full charge cycles - one cycle being any combination of charging that together sums to a 100% charge. The indicated battery health is displayed as an integer value, rounded down, starting at 100% health.

Your iPad indicates 90 charge cycles; on this basis, other factors aside, your indicated battery health would not be expected to exceed 98%.

If you are concerned, you would be well advised to seek assistance directly from Apple Support - and request a remote battery diagnostic test. You can contact the Support Team using the Support link at top-right or bottom-left of this page.

Alternatively and perhaps easier, 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/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 hands-on test and assess your iPad:

Genius Bar Reservation and Apple Support Options - Apple

Probably not; Apple isn't obligated to replace the battery until it's gone below 80%. It's normal for it to lose 1% every month or two depending on the model.

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