The Bluetooth headset can be charged by the phone's 5V charger, but the charging plug must be the same size as the headphone jack.
The whole point of answering this question is. Just a hint. Don't charge Bluetooth with the fast charger. I found using the computer's usb with a small Bluetooth device around 200 mah. 5 volt interface charging is more stable. Use the power bank sparingly. Others with Bluetooth sports headphones. It is recommended to find a plug with an output of about 500ma to charge. If you don't have the right one. Just plug it in and charge it.