Antigravity Batteries at 1625 West 134th Street, Gardena, California.

Very disappointed. I’m a mechanic. I purchased an XP 10 to boost cars with weak or dead batteries. In the first year I used it successfully twice. I also recommended it to a colleague of mine. His failed after six months. They provided a replacement. I made sure that mine was kept charged. When it was a year and three months old it would no longer start a car with a weak battery. I contacted their warranty department.
They basically said too bad. $225 down the drain. I wouldn’t recommend anybody buy this product.