They used to last 5 hours; now they die in minutes.
The internal batteries are tiny and give out at 2–3 years. There's no avoiding it.
Battery replacement. AirPods are ultrasonically sealed, so we open them, swap the cell, and reseal. You pay for the skill, not the part.
It depends on the model and on what we find inside, so we quote each repair individually. The diagnosis fee depends on the device, and you approve the exact repair price before any repair starts. If it can't be fixed, you only pay the diagnosis.