I keep hearing " Optima batteries quality has gone way down " but I just replaced mine that is dated 2009. Even then I still didn't give it up for a core because its still good. Instead I pulled the battery out of my civic which was showing signs of weakness and gave that one up for a core then put the Optima in it . . . . . . . .D51 Yellow Optima ( it's a half size ) laying on its side all day long, no issues what so ever. . . . . . . .Only replacing (with another Optima) for peace of mind. After all it is 10 YEARS , lets get real.