I bought this same battery almost a year back but killed it leaving it in my ride for six months without driving or charging it. I have not figured out if it is possible to save it but it would not keep a charge for very long and turning the car on was not easy. So I bought a new one and it is working really well. I like that I will not have to put any water in it and I like its compact size.Battery failed 4 months after install after paying over 200 dollars for an extreme duty battery and using it normally in a Toyota car it shouldn't fail their warranty says it only will cover if it will hold a charge if it held a charge I wouldn't have a problem it is defective and won't hold a charge don't buy from themGreat battery!Well I used one in one of my cars and after 5 years of leaving it discharged completely over 5 winters it would still take a charge and start up my car ..well I guess the 6th time was too much and the battery won't hold a complete charge any more ..still it lasted along time .