My old PB battery lasted about 4 years, then it was replaced under the Apple recall. The new one lasted about a year before starting to last less time, and now only lasts about 12 minutes! I have tried conditioning but to no avail. The battery was used 50% of the time and therefore did not spend weeks and weeks connected to the mains. Is this a fault with the battery or PB? I can get a new one on eBay for £25 but do not want to if the same thing is going to happen. Anyone else experienced this problem?