They are made by Johnson Controls, same as the Kirkland were. There are only a few companies making batteries in the US and they label them for all the brands. The manufacturers I know of are Johnson Controls, US Battery, and Trojan. There may be others. Just about any battery you buy will be one of those 3 with the majority being Johnson. Interstate Battery | US Made in America Products & Company Listing Directory

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra