Battery keeps Depleting Quickly

For that model, you want the battery specifically for the iPad Air 11" M2 (6th gen), model A2902 (Wi-Fi). The iPad Air 11" M2 uses a 28.93 Wh battery.

I would not order based on iPad Air 6 alone, since the 13" version and cellular models use different parts.

Also, before replacing it, check the battery health/usage in Settings. Rapid drain can sometimes be caused by an app or software rather than the battery itself.