Have May 2012 these radiators was bought at the beginning also very satisfied now inzwichen after one year and 3 months, I realized that a radiator no longer works so this article is not as special as only accepted .wollte been with the company Escotec Contact but unfortunately on Amazon probably not possible. Because when the article is nowhere "Contact with the seller of" I find a shame. In the product description is continued below replacement battery can be ordered but it is not specified where and how