Hi Kiwi Sapper,
With this unit like many of tne of the PLBs on the market the batteries are not user replacable. This is because during battery replacement manufactures with perform other tests to ensure the unit is still meeting it's type approval specs. A common mistake with sealed units is people can accidently not seat gaskets and seals properly without noticing leading to condensation inside and premature failure, People do make mistakes when servicing their own equipment and without all the right test equipment it can be hard to identify the mistake. The last thing any retailer, user or manufacturer wants to hear is that someone died or their beacon didn't work after they serviced the unit themselves. Having the batery replaced by an authorized agent means the unit will function correctly when you need it the most.
I apologize for missing the exact question you posted originally hopefully this helps answer the question and sheds some light on the reason why.
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