Where can I get a new Sennheiser VMX100 Bluetooth headset battery?

I have a Sennheiser VMX100 Bluetooth headset that went through a wash cycle in the laundry. I suspect the battery was shorted out as it will not charge now. The charging light will come on when plugged into the charging adapter but will not change from red to blue indicating the end of the charging cycle. So I would like to try replacing the battery or get the unit refurbished. Any ideas?

Thanks,
I didn't find the right solution from the internet.

References:

-http://ift.tt/2p0hxfU

- Wealth Management Software Video

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