Dutch mariner, Meijlink purchased three 12V Infinitum Desulfators from us back in July 2009 which he used for his yacht batteries. He purchased more a week ago for his friend and left this testimonial:
After installing the Infinitum desulfators 8 years ago in my yacht I never replaced any batteries any more. The starter battery is already 14 years old and still working perfectly, my service batteries are 8 years old now and I cannot notice any loss of capacity.
I use a battery monitor and the batteries are charged by solar panels and a battery charger when needed.
I am buying more desulfators now, 8 years later, for a friend who is really impressed with the product after hearing my testimony.