MacBook Pro owners! (especially older MBPs) Do you have battery issues?

My MBP (macbook pro) is almost exactly 2 years old.

Supposedly (according to the Apple website), my battery should stay at ~80% capacity for up to 300 “cycles”.

However, my first battery crapped out about a year after it was purchased, and I replaced it with my current battery.

It’s been about a year since my replacement, and it is, again, dying on me.

(According to iStatPro, I’ve had 78 cycles, and my batter is at 38% health.)

So here’s the question: does anyone else have similar issues? (It’s a known issue with the batteries issued during the time my MBP was created.)

Have you had to replace your battery more frequently than you should?

Any ideas for prolonging battery life (once I get a new one)?