If the Bluetooth headset is not used for a long time and has a built-in lithium battery, the lithium battery is usually damaged due to excessive power loss. Simply replace the battery.
1. Lithium batteries are generally used at least once a month. Normally charge it as you go and discharge it completely at least once a month. This is better for the lifespan of lithium batteries.
2. If the lithium battery is not used for a long time, such as six months or several years, after the battery is completely exhausted, the battery core may be completely damaged. Cells or batteries need to be replaced.
3. If the headset has a replaceable battery, simply replace it with a new battery. If it cannot be replaced, you can try the freezing method. Indeed, many Internet users ont reported that this method sometimes works: after sealing the headphones in a plastic bag to ensure no moisture can get in, putting them in the refrigerator for a few hours. After removing them, many batteries came back to life. .