The batteries on eBay are often sold by “ElectroPapa”. They sell many, many batteries for a wide variety of devices, I have one in a DAB radio for about ten years already, another one in a notebook computer, and there’s nothing to complain about them. I know that using third party batteries voids the warranty but we are talking about a device that is out of warranty for at least 5 years already and the company selling the third party batteries is big enough to generate some trust that their batteries won’t blow up easily.