Michael Ross wrote:
In the eighties, not counting Yuasa who only made motorcycle batteries then, for a time there was only one PbSO4 battery manufacturer - Exide. All of them Interstate, Diehard, Exide, every single one, was made to spec by Exide. If Dies hared and Interstates were really better it was only because they spec'd them to be better. Nothing much has changed there are just a few more manufacturers. So the quality and warranty issues are all on the people specifying there design, selling them.
No; there were dozens of manufacturers in the USA alone; hundreds more in the world. Lead-acid is a very old simple technology, so lots of people made them.
In the EV world; Trojan, Hawker, East Penn Mfg Co, and ESB immediately come to mind as big manufacturers in the 1980's.
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