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After two years, most batteries degrade heavily, anyways.
My current laptop (Dell Precision 7510 mobile workstation) has quite a large battery, and when I obtained this laptop about two years ago, I could get around 8 hours of battery life with medium usage (browsing, a bit of writing, some calibre organization/e-book editing) and medium screen brightness. Now, I can only get 4 hours of battery life. In another 2 years, it'll probably be down to one hour, and then the battery will stay there for a long time.
My old Lattitude (10 years old at the moment) dropped from 6 hours of battery life to about one hour in four years, and it is still at that point. Maybe... just maybe, I'll replace the battery and use the laptop as a backup system. (It runs Windows 10, has an SSD, and 8GB of RAM, and the C2D is still fast enough for general tasks such as browsing, mailing, and things like calibre, if need be.)
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