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It's likely to be a Li-ion battery. As such, it will age, but you ought to get several years service out of it. Lots of information here:
In 2020, small wearable batteries deliver about 300 cycles whereas modern smartphones have a cycle life requirement is 800 cycles and more.
For example, here's a comparison of two iPads, the one with 443 charge cycles is like brand new. But the one with 771 cycles can only hold a maximum of 65% of its original charge. That said, at 5 years old, 65% capacity is still perfectly useable.