It may be that there is a problem with the battery of the Bluetooth headset itself, resulting in short battery life. There is interference with the Bluetooth signal around the use of the headset, which speeds up the use of power. When connecting the mobile phone, it will also increase the power consumption of the headset, and timely put the headset into the charging box when the headset is out of power.
There is a problem with the battery core, or the battery does not have a protective plate, causing the battery to discharge itself.
It's the quality of the product itself. The chips used should be Lodha, Jerry or low-end chips, which consume a lot of power. That's the cost issue. The battery capacity itself is relatively small, small headphones are generally at least 100 ma or more, and large headphones are more than 350 MA. It's also about cost.
The connected device emits relatively large power, you can change the mobile phone to test whether the time is the same.
Because the headphones are old, so the battery is dead so the charge is very fast
Probably because you use your headphones a lot