I purchased my first unit 8 years ago. Very happy customer here. I bought a new Toyota Innova (A) in 2010 together with Infinitum and installed it at the same time. I changed the original battery 4 years later. The battery was still good but I was concerned it might break down in the middle of nowhere.
I am using the 2nd battery until now. It has been more than 4 years now. For this battery I will wait till it fails.
Dr. Mohd NizamUniversity of Science, Malaysia 
Most batteries in warmer climates like the one found in the tropical climate of Malaysia usually last 1 to 2 years. The doubling of the battery life span that Dr. Nizam enjoyed from the single Infinitum Desulfator unit he purchased from us not only saved one but two batteries and will continue to do so for a few more batteries.
Below are images he sent us:
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