If you're looking for a suitable replacement battery for the Apple MacBook Air 13" (M1, A2337, 2020) model with part number A2389, you'll want to ensure the following key points for wholesale:

1. Compatibility: Ensure the battery is specifically designed for the MacBook Air M1 (A2337) from 2020. Apple models can be specific about the battery design, so double-check that the part number is A2389 and that it is compatible with the M1 chip variant.

2. Quality Assurance: Verify that the batteries are high-quality replacements, ideally from reputable manufacturers or certified suppliers. Poor quality batteries can affect performance and safety, which is crucial in wholesale.

3. Supplier Certification: It's important that the battery suppliers have certifications such as CE, RoHS, or UL, which ensure that the batteries meet specific safety and environmental standards.

4. Battery Capacity & Performance: Check the battery’s specifications to ensure it offers a similar capacity and runtime to the original (the MacBook Air M1 has around 49.9Wh). Performance should mirror that of the original Apple battery to maintain user satisfaction.

5. Warranty and Returns: Most reputable wholesale suppliers offer warranties on replacement batteries. This is essential for your business, as it will help you offer returns or exchanges if the product has defects.

6. Bulk Pricing: For wholesale, negotiate bulk pricing to keep your margins healthy. Suppliers often offer discounted rates for large orders.