“Two” is not “years” in my opinion. “Years” implies at least 3-5.
“The battery lasts two years”
But I did have a similar thought when I read it was only “two”
I think most people, when told that something will last for "years", would be quite surprised to learn that it will fail after 2 years.
For example, I have motion sensors in my home and I have to replace the batteries from time to time. If the manual said "the batteries last for years, depending on usage" I would not be surprised if it lasted for 2 years.
Here, it sounds like the battery life will vary greatly based on usage. In fact, it sounds like the battery life is almost entirely a function of how much you use it. It would be interesting to know how much the battery will drain over time if you don't use it, but of course we can't know this for certain before this has been in the wild for years.
If someone said “that’s years ago” I’d assume 5+. If someone said “it’ll be years before that’s released” I would again assume 5+.
To be two I would expect “that’ll be out in a couple of years”, or “in a year or two”.
For this ring I would write “battery life is between 12-15 hours of use, which will typically last about two years under normal use”
3 years: Few years
4 years: Several years
5+ years: Years
Even this is misleading. The product hasn't been released yet. So what is it an average of? How do you know how people will use it?
Think of it more like this: If I was selling you a car and said it would last for years, then would you expect it to fall apart after two years? I certainly wouldn’t. When talking about small quantities we tend to specify an exact number (two, three), however as the range becomes larger and less exact we use generalities (years). Because of this “years” would typically refer to a span of at least 3-5 years, and I would argue even longer.
Edit FTA:
> How long does the battery last?
> Roughly 12 to 15 hours of recording. On average, I use it 10-20 times per day to record 3-6 second thoughts. That’s up to 2 years of usage.