My AirPod modal A1523 always get disconnected when i try to use
My Airpod even fully charged when I connect to my iPhone it gets connected but gets disconnected and i am not able to use it for a few months
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Model A1523 is the original version of AirPods now around 5 years old, so it is likely the battery may be approaching the end of its useful service life. Weak battery would probably cause the disconnects you are seeing.
You could Contact Apple Support if you need confirmation and arrange to get them checked by Apple's service technicians, but my advice is to start thinking about replacing your AirPods with a new model. We don't know what Apple will announce in the annual updates (probably September) but there are usually some good discounts and other offers available around this time.