Pro-rated warranties aren't necessarily bad - it's too short warranties that are bad. e.g. Costco's warranty on car batteries in Canada is 100% for four years,

Pro-rated warranties aren't necessarily bad - it's too short warranties that are bad. e.g. Costco's warranty on car batteries in Canada is 100% for four years, 50% for the next 1.5, 25% for the next 2.8 years, (100 months total warranty) and claiming the warranty is just a matter of bringing your battery to the returns counter.