Apparently, I have the original battery from 2000, and it was well kept since it performs, as well as I can tell, flawlessly.

I've had only one "recal" in 9 days and 500+ miles of driving.
I think that is normal, but others can chime in since I've had it so briefly.

If you buy a 2000-2004 you get a 10yr/150,000 miles warranty on the hybrid battery. If you buy a 2005 or 2006, you get 8yr/80,000 miles I think. ( or is it 6yr/80,000 ? ) Anyhow, I'm sure of the 80,000 part.

I guess early on, the BMS was not optimized, and Honda offered ( retroactive ) a longer warranty. The 05 and 06's came from the factory with better battery management I guess.

I'm not really an expert, yet... but I'm having fun getting 64-94 MPG depending on speed, and I get looks and questions everywhere I go.
People act ( out here in the mid-west ) like they've never seen one before! They think it is the newest thing... it's funny when I tell them it is the oldest thing... and they are disappointed they can't go out and get one!

-John