That probably explains..
..why my five year old iPad is like a snail on the tortoise's back.
And another thing: If the battery degradation is so great as to warrant this, why not fit a bigger fecking battery to start with, rather than trying to make every new model even slimmer than the one before. I for one wouldn't mind an extra 5mm thickness in exchange for a battery that pumps out the power for 5 years. It's a premium product and should be bloody well engineered like one.