Auvio Bluetooth Headphones Battery

The Bluetooth 371 headphones are manufactured by the brand MPOW. According to the manufacturer's website, the headphones use a built-in rechargeable lithium-ion battery, which can be charged using the included micro USB cable. The battery provides up to 20 hours of playtime on a single charge, and can be fully charged in approximately 2.5 hours.
Therefore, the Bluetooth 371 headphones do not require replaceable batteries, as the battery is built into the headphones and can be recharged using the provided micro USB cable.
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Could be the battery has a weak charge! Try running the battery completely flat, recharge fully, then run completely flat, and repeat this cycle about 3 times......This will give the rechargeable battery a revitalised full charge! This is a good procedure for any rechargeable battery as part charging and charging when not completely flat does take its toll on a battery.

Sounds like the rechargeable battery in the bluetooth device has failed. (Most bluetooth devices do not have batteries that are replaceable.)

I think what you are asking is how to connect the headphones to the iphone via Bluetooth.
switch on the headphones Bluetooth....go to general settings in iphone ... Switch on iphone Bluetooth....then choose detect devices....when it finds the headphones... Click "pair" ...it will let you know if pairing was successful.once it remembers the device you won't need to do all that again next time you want to use the headphones.now and again you will need to charge the headset up.

Charge your headphones and while they are charging press the call button and the volume up button and you problem is solved. After that just let your headphones charge.

Reset your headphones by pressing the call button and volume up while they are charging.

While your headphones are charging press and hold the call button and volume up button and your problem is solved.

the code is 0000

The device beeps when the battery is low, recharge it and it will not beep anymore. This has happened to me in the middle of the night and my dog went nuts LOL