This product saved my car's life because the dealer's car alarm went off and my car's batteries went dead. I had to buy a new battery, after installing the second battery it was also discharged. I took the car to a dealership and they wanted me to pay a lot of money to have the faulty car alarm removed. After investigating the issue, I purchased this product and have had no more battery issues. I had a small technical issue with the charging connector being too small for my car battery cable, but a quick trip to the auto parts store to get a receipt for the battery connector fixed the issue. I recommend this product.