⌚ Smartwatch battery barely lasts a day anymore after a year of use

Bought a smartwatch almost exactly a year ago, and battery life that used to comfortably stretch to about four or five days on a single charge has now dropped down to barely lasting through one full day, sometimes even needing a top up by evening if I have been using features like continuous heart rate tracking or GPS for a workout earlier that day. Checked the battery health setting buried in the watch's own software, it showed something like eighty percent remaining capacity, which the manual explains as fairly normal degradation for a battery this age with daily charging cycles, though the actual difference in real world battery life feels far more dramatic than an eighty percent number would suggest to me looking at it purely as a statistic. Tried the usual suggestions from a support forum, turning off always on display, reducing how often the watch checks for notifications, disabling a couple of background health tracking features I was not actually using much anyway, and it did help somewhat, stretched things back out to maybe a day and a half instead of struggling to make it through one full day. Part of me wonders if this is just the expected lifespan for smartwatch batteries specifically compared to phone batteries, given how much smaller the actual battery cell inside a watch is to begin with, which would mean this drop off was probably always coming regardless of how carefully I used the watch day to day. Not quite ready to replace the whole watch over a battery issue alone since everything else about it still works completely fine, but also not sure if a battery replacement service actually exists for smartwatches the same way it does for phones, or if that is even a realistic repair option worth looking into. Has anyone actually gotten a smartwatch battery replaced separately from buying a whole new watch, and was it worth the cost compared to just accepting the shorter battery life or upgrading entirely? Curious what people have actually done once they hit this same point with their own watch.