From another forum dated June 2006:
"the top two car battery manufacturers, Johnson
Controls, Exide, private label millions of car batteries every year.
Actually here is the line up:
Johnson Controls is the largest manufacturer with 31% of the total
followed by Exide with 14%, GS Yuasa (pending merger of Yuasa and
Japan Storage Battery) with 10%, Matsushita with 4%, East Penn (Deka)
with 3%, FIAMM with 3%, and all others with 35%.
ACDelco is a branding by General Motors and most of their batteries
were manufactured by Delphi, but Delphi sold their car battery
manufacturing business to Johnson Controls last year.
Please see Section 7.8 in the Car and Deep Cycle Battery FAQ on
for some buying tips."