Batch #1699, 1700 kick ass. I swiched over from QV test E and noticed a differnce in a few days. Over filled by 10% and $7 an amp what a deal! I've got 20 amps and got another 10 coming. I am definately stocking up on these as much as I can. I'd like to get 100 or so for future cycles as the expiration is 4 years.