I've had many battery charger and maintainer failures over the years. And the failures don't seem to be related to price. I've had expensive ones fail right along with the inexpensive ones. And of course no one will fix the expensive ones. That's frustrating, but what's really upsetting is a manufacturer who refuses to honor their warranty! I bought an Optima branded charger that was bad out of the box. When I tried to claim warranty Optima simply ignored me. I followed their convoluted process and was told that Optima would review the situation. Then nothing happened. When I called back to follow up I was told that the "supervisor" would have to "clear it". Then nothing happened. The next follow up another week later got me the reply that "shipping had screwed up again". The next follow up a couple of weeks later was that my claim would be expedited. Still no response weeks later, they simply ignored me. After a couple of months and way too many calls I contacted my credit card company and made a claim with them. They were polite and told me it could take up to 90 days to investigate. After 90 days I called the credit card lady back to see what the verdict was. She told me that the vendor, Optima, failed to respond to her inquiry. That didn't surprise me. The credit card company refunded my purchase. I wonder if other folks have been ignored when making warranty claims with Optima?