If your AirPods are not working properly, there could be a few different reasons why. It could be that your AirPods need to be charged, or that there is something wrong with the connection between your AirPods and your iPhone.
If your AirPods are not holding a charge, it may be time to replace the batteries. You can do this yourself by following a few simple steps. First, remove the ear tips from your AirPods and unscrew the back cover using a small Phillips head screwdriver. Next, gently pry open the battery compartment and remove the old batteries. To install new batteries, simply reverse these steps. Once you've replaced the batteries, screw on the back cover and reattach the ear tips. If this doesn't solve the problem, then there may be an issue with the charging case itself.
If your AirPods won't connect to your iPhone, make sure that both devices are turned on and in range of each other. Also check to see if Bluetooth is enabled on both devices. If it is, try restarting both devices and then attempt to reconnect them. If they still won't connect, then you may need to reset your AirPods altogether. To do this, press and hold down the setup button on the back of the charging case for about 15 seconds until you see a white flashing light on the front of the case. Once resetting is complete, try connecting them to your iPhone again