Almost all Panasonic 10Ah batteries have lasted well beyond their 2-year warranty. There are many 2007 vintage batteries still giving useful service. They don't suddenly dematerialise after 2 years have elapsed you know. We haven't had final confirmation of the new battery's warranty cover, so you are jumping to conclusions.
Good evening Tim
It depends on how you define lasts. When a consumer buys a battery with a specified capacity and specified life expectancy guaranteed for two years, that is what they are buying into. Experience shows the batteries are falling short of this.
If I only wanted to go to the top of my garden and back, then the battery may, "last" for many years beyond the warranty period. However, if you want to do anything approaching a 20 mile round trip, it won't last 2 years.
I suppose what I am saying is, that these batteries are a massively expensive consumable item. Some of the claims made regarding their performance is approaching the misleading. As a rule of thumb, my experience tells me to divide all claims by 2 and only expect to use the battery for the warranty period.