I'm on my third battery for a Macbook Pro and I never paid for it to be replaced.
First replacement was for a safety recall with all the exploding laptop batteries a year back. And the 2nd replacement was just replaced yesterday (I love battery cycle count == zero) because BatteryUpdate 1.3 broke the battery.

I feel like I'm walking a very thin tightrope here cause I didn't buy ACPP and any catastrophic failure to my MBP will be absolutely dreadful. But hopefully this thing will still go strong for the next few years as I only need a few more to earn enough to fund a replacement.