Im with burnt toast on this one. The only thing is they dont go by batch number, but by formula number, which the current is 4.0 i think. Check on the website, it states it there
I've used, tested, (and/or exchanged) many batches of the Quick Fix since 2002. Theres a formula number and a batch number.

The formula number is printed on the bottom flap of the box, the batch number is printed on the instructions sheet located inside the box. As I already stated, the batch number is used to determine when that particular batch was manufactured. The 18-24 month shelf life begins on that date of manufacture. You do not go by the formula number. Formula 4.0 has been in existence since late 2003.