Excellent: 38 days autonomy. Some people favor that. Make it ip67, and this could be a hit. There is plenty of room there in the market.
But it can probably last you about a week with moderate usage. That's how a lot of dumbphones (and even Blackberries) used to last before the iPhone, and all the touchscreen phones that arrived after it, but I think most people have forgotten that.
It's because they used very limited operating systems and small screens with small resolutions, so they don't use nearly the same amount of power as today's touchscreen smartphones, with 4"+ screens and ~720p resolutions.
As long as coverage is decent and I have reasonable signal levels that's usual. With weak signal levels or no service when it's hunting for service the battery will go flat in a day or two.
> "They don't actually last that long."
Actual mileage depends on your usage. The talktime rating is meaningful for such comparisons.