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Are the batteries going to be replaceable? I worry when the battery ages it won't last through the night. At 10 hours of charge maximum, if the battery loses just 20% of its max capacity, I would run risk of the battery not making it through the night.

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No they aren't. We have 500 cycles (I believe, maybe more if we change the charge rate) of our battery before it goes to 80% of max capacity, which is still 8 hours.

Even if you were to use the same device for years, the sound masking would just turn off prematurely in the night and make sure it preserves enough juice to sound the alarm in the morning

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