Genesis battery

Hi, I’ve had my genesis for over a week and my battery seems to last about 4 to 5 hours and I do not use it that much. I own a prime so I know a fair bit about these watches and I’m not comparing it to my prime for one second.
I’ve done 3 factory resets and still the same, my settings match my prime and that run with no issues.
I have my sim installed also tried without my sim.
My question is if I flash will it make the battery better or is that what people are getting from the battery?

Thanks