Apple headphones for a long time do not charge the battery will be bad, the battery itself will self-discharge, a long time do not charge the battery will automatically run out, the battery is exhausted after a period of time without charging, the battery is generally damaged and can not be recharged, the product itself is not placed in a humid and high temperature place will not be bad.
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For electronic products, a long time (more than two months) do not charge, then the battery loss is sure to be there. And for AirPods, pencil, and a variety of wireless Bluetooth headsets such as the battery capacity is very small, many (more than two) for a long time without charging (more than three months), the battery life loss rate will be relatively large, in the future use of large probability will appear a significant decline in battery life. But in general it will not result in complete failure and unserviceability. It is recommended that electronic products with small batteries be charged once a week to ensure the normal life of the battery. But not charging for a month once in a while is no big deal.