Your video helped me open my headset with more confidence! Piece of advice, don't use a heat gun anywhere near that yellowish-greenish foam!

The battery you are looking for is 503030. 50 for 500mah and 30 for 30mm. Similar sizes should fit. I wouldn't go above 35mm on any one measurement. Try to stick with 30mm or less and the battery should fit.

Thanks so much for your video. My speaker had stopped working on the battery side and I had no clue how to get inside to take a look. It was a broken wire, soldered in a replacement, all back together and working. You've saved me the cost of a replacement.

Thanks for the effort to post the video. Was very helpful to replace my battery and give it new life.

If you are looking for the correct battery search for 3.7V 403029 (1.2Wh / 360mAh).

Thanks, I changed it in my headset based on your vid. Hope the new battery doesn't burn my house down :)

Thanks for this video. It saved me a lot of money and gave me the chance to restore my Focus UC Headset.

Thanks for the video. I now have a new battery in my Focus headset.

you can get away with a 500 mAh battery, I used that in mine. this video was definitely helpful in opening it up. thanks for the video!

I was planning to buy a Plantronics Voyager 2 headset until I saw this video. Although I am capable of doing the battery replacement it is ridiculous that they have made it deliberately so difficult to do that they are obviously trying to get people to throw away the headset and buy a new one. So wasteful. Shame on you Poly/Plantronics!

thanks for posting this - very helpful. it would be a shame to have to change a perfectly working headset only because of the battery

great tutorial, just changed the battery in a couple of mins :) thanks bro. actually no need to fix the new batt with tape...would make it easier for next time change...

Awesome video . helped me contributed 1 less item to e-waste.

Ordered the battery, asked myself "now what"? And saw this. Now I'm encouraged by all the comments below. In any case, what PLT did here was... not pride-inspiring.

Thanks ;) Battery swapped. Everything works.

Procedure for Voyager V4220 is very similar to this, but the tiny battery is in the same side of the headset as the microphone, micro USB port, etc. The battery is different to the example in this video as it is has the code 1ICP4/25/38 (25 x 38 mm, I believe), and has 3 wires (red, white, black) instead of 2. Looks like the white wire could be related to battery temp monitoring, or validating that the battery is supported by the device.

Thank you, I didn't see that the foam can be removed to revel the screws

You can also calculate it. P = U * I which leads to Wh = V * Ah -> Ah = 1,3/3,7= 0,3514 Ah = 351 mAh

Thanks for the tutorial!

Thank you! You just saved another headset.

thank you! btw, i use these headsets for 4 years and i replace them every 2 years because mic stops working: battery has never died but mics die regularly due to movements up and down and cable breaks

any links for the replacement battery recommendations?

Awesome, thank you!

The disclaimer at the start which is up for far too short a time to read without going to fairly exceptional efforts states: This is for personal information only. Modification described in this video is not factory approved or authorized. Defective battery can cause hearing damage. Use any information in this video for your entertainment only and at your own risk.

Terrible that the change of a simple akku needs so much work. Are they nuts? Do we live in 1982. We want sustainable products. And Thx for the video!

What kind of battery life you getting with the replacement battery? Trying to figure out how bad the talk time should get before replacing it.

Nice one mine would benefit from a new battery .

what is the size of the heat shrink sleeve? what dia should we use?

Do you have any videos of the wiring? I need to reattach some in my headset.

Where can I get the low temperature solder sticks, how do you name it ?

Bro can you help me with opening tutorial of mic as my baby broken that and I wanted to repair it

My headset is in perfect shape and does not want to charge in the cradle or plugging it in. You think it could be battery?

will this fix the issue with one side (the battery side) not working.

Hi can you please share contact I need help really as my daughter broken my headphones mic and it's too costly here in India to get new one. I wanted to repair it and in need of please help I have disassemble it so far but not sure how to remove mic connector strip and pull it out from mic

absolutely terrible design, commonly the two screws on that flex bracket blow out, there's no way to fix it as it screws into the housing, and if you glue it you'll never get it apart again.