Does anyone know how to disassemble a Jabra Engage 65 CONVERTIBLE?

I have a bad battery on this device, but I haven’t figured out how to get to it. The link to the product is below.

https://www.jabra.com/business/office-he...

I found this site, but I do not have a ‘swtich’ on the side of my headset to be able to get to the battery so I dont think this is the right diagram.

https://www.simplyheadsets.com.au/user-m...

Any help would be greatly appreciated.