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This problem is usually due to a misconfiguration of the earbuds. Try resetting them. Place them inside their case, close the lid and wait for 6 seconds. Then open the case and press the Bluetooth button for 30 seconds and you're done.

But there are also other reasons why your BOSE Sport Earbuds may not be charging to 100%. Here are a few things to check:

Make sure the earbuds are properly seated in the charging case.

Ensure that the charging case is properly plugged into a working power source.
Check the charging cable for any damage or wear.

Try using a different charging cable or power source to see if the issue is with the cable or the power source.

If none of these steps resolve the issue, it may be a problem with the earbuds themselves, and they may need to be repaired or replaced. Contact Bose customer service for more assistance.