acroyear
500+ Head-Fier
Well it's probably the same design as modern smartphones - glass sandwich with metal frame. It's not that hard to open up, any smartphone service shop could do it and there are a bunch of guides on youtube as well, most use a heatgun.
The bigger issue could be finding the specific battery, unless you could buy a direct replacement part.
There is an electric hot plate you can buy that heats to the correct temperature to soften the glue. Once glue is soft after a few minutes, you pry open the device and access the battery. Get the measurements and specs for it, 3.7 volts and the mAh. Then order a battery from eBay or somewhere else and install with solder iron.
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