Jo, that's already something very strange again. I can only agree with the reader in the Spiegel forum: since when does Spiegel report on end-user problems with consumer devices in the USA?
And the fact that a battery eventually dies with frequent use - and that 300-500 charge cycles (incidentally, only partial charge cycles count as full cycles for the lifespan of lithium-ion batteries!) don't last forever - anyone can easily calculate for themselves...
At MacGuardians there's the original article.