I have an original battery that came with the car. 07 TL-S.
The battery says "100 month warranty" but according to the dealers the battery is only warrantied for the period your car is warrantied (4 year or 50k whichever comes first). I have 93k on my car. A bit misleading as on the battery it says "100 month warranty" The dealer says it's only 100month warranty if you have replaced it there and is not applied to the original battery. Anyone have experience with this at all? Also when (mileage and year) did you change your battery?

 

That dealer is full of shit. Take it back and throw it through his back window. Then piss all over his car.

 

The original batteries are known to die prematurely. I can't remember my mileage in the 04 TSX, but I think it was about 2 years old and 30K miles. I replaced it with a Yellow top battery which I transferred into my 08 TL-S before I drove it off the lot.