Did you spot anything from the log? Or is 6months more realistic battery life?
Perhaps our usage was a lot more than your standard 10times/day average usage, being a house of 5 people. But then you should do further research of realistic battery expectation, instead of 10time/day blanket that would cover only small segment of users.
More troublesome was the wrong battery indicator. Before dropping to 15% it was showing 100% the whole time except for a few times it showed 90 or 80 something, but it got always back to 100% after software update. Being locked out due to false battery indicator would be a big failure point for the product.