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I think I'm the only one (apart from the Japanese ) to use lifepo4 batteries. Graupner produced two models of lifepo4 batteries (one rounded 3000mah as a perfect fit for vintage models and one squared 4000mah), but now it's in bankrupt and I don't know where to get new batteries ... do you have any information?

With all the excitement around Kyosho's re-releases, especially the Optima, it's been rekindling in me a never-satisfied curiosity to know more about the relationship between Cox, Kyosho, Graupner and maybe other companies that seem to have been branches of one another, or formed out of one another, acquired by one another...??? I really don't know! I'm fairly certain that Cox was a U.S. company originally, and Kyosho is obviously Japanese. Did Kyosho buy Cox at some point? Who knows the story??