I bought my aluminium macbook in January 2009 and about 6 weeks ago it started to only estimate about 1hr 40min on the battery after a full charge. But it will turn off at various times with no warning, sometimes after a few minutes, sometimes after up to half an hour. The battery indicator says 'service battery'. I've only just got round too getting it looked at by an apple repair shop. They ran diagnostics on it and confirmed it was faulty, but when they spoke to apple they said battery wasn't covered after a year (even though i have applecare) and wanted AU$260 for a new one. The Notebook batteries page on the apple site says "For Apple notebooks with removable batteries such as previous generation MacBook and MacBook Pro computers a properly maintained battery is designed to retain up to 80% of its original capacity at 300 full charge and discharge cycles." Mine has done 294 cycles (and would have done quite a few less when the problem first came up), should i be entitled to a new battery under warranty?