system clock slow
I am having an issue where the clock on my Macbook Pro is slower than all my devices. I have it set to set time automatically, but it first starts at one minute slower than my other devices, and then progressively slows down from there. I can fix this temporarily by going into the date and time pain of system preferences, where it seems to sync, but it eventually slows down again. I have tried resetting pram, but I wonder if something is wrong with my battery. I read somewhere that if internal settings on a portable computer don't work correctly, the computer's battery may need to be changed. Could this be the cause?
MacBook Pro (13-inch Late 2011), OS X Mavericks (10.9)