They're hoping to get a day and a half or so out of this thing? I've a Garmin Venue 2 that will last more than 2 full days with heavy use (6+ hours of GPS mapping) or about 2 weeks with no manually triggered activities. When it's low I just charge it when I take a shower and it's good. I absolutely would never use a watch that was designed to both track my biometrics regularly and require daily removal.
Got mine for free with the 8 Pro, I just ordered a couple more chargers to leave in the bathroom and on the couch. It does typically last me a little over a day if I have AOD off, which doesn't bother me, I typically just charge it at my desk. I have had it run out on me once or twice and had to wear a dead watch for a bit. Id like it if it lasted at least 2 days