Getting battery replacement for iPad Air 2: where and how much?
Where can I get a battery replacement for my iPad air2? How much will it cost?
iPad Air 2, iPadOS 15
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Go to this web site for information about how to request battery service for your iPad: iPad Repair & Service - Apple Support
For cost and availability, enter your model information in the "Get an estimate" box at the bottom.
Is it really time to change your battery? See this excerpt from: Batteries - Maximizing Performance - Apple
"A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge."