iPad battery needs to be replaced
iPad Pro 9th generation
[Re-Titled by Moderator]
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You can establish eligibility and cost of a battery replacement in your country/region here:
iPad Repair & Service - Apple Support
You might choose to 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 - prior to committing to a battery replacement or other repair:
Genius Bar Reservation and Apple Support Options - Apple