How do I replace a battery on my iPad?

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

For practical purposes, in lieu of servicing and returning your own iPad, Apple usually exchange the iPad for a renewed/refurbished iPad of the same model and specification. The cost of the exchange is the same as would otherwise be charged for battery replacement.

If you have an active AppleCare+ plan, the cost of repair is reduced to a small excess/deductible fee.

The battery in an iPad is not intended to be user-servicable. It is possible to do, but it's quite difficult and it's very easy to permanently damage the iPad. As Katana-San said, you should take the iPad to an Apple Store or authorized Apple service center.

Regards.

Hello~ Best take it in to Apple…

Genius Bar Reservation and Apple Support Options - Apple

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~Katana-San~