Below is a step-by-step guideline on how to charge AirPods Pro case.
Step 1. Pick your low-battery AirPods pro case.
Step 2. Take the cable charger you can find in the box if you just buy the AirPods pro. Plug the USB-C into the case and plug the other end of the cable into a USB charger or port.
Step 3. Make sure to charge your AirPods case with the lid closed.
Step 4. Wait until the status light is green, which means your AirPods are fully charged.
Step 5. Plug out the charger.