"There's some stuff I work on. For some reason, I'm always hesitant to say what it is," said Posey, who entered Saturday's exhibition against Oakland with a rousing .435 batting average (10-for-23). "I don't know why I am. I just like to keep it to myself."
Posey said that he doesn't need to accumulate a certain number of at-bats before he can declare himself ready for the season.
"I think it's just about feeling good about where you are," he said. "... I think spring's a process, a combination of trying to get your swing where you want, but also get that game feel back. You can swing all you want, but until you get in a game and actually get the feel of a game, it's hard to simulate that."
The Giants catcher observed that he didn't amass an unusually high number of at-bats in 2012 after recovering from the horrific left leg injuries he sustained in May 2011 during a home-plate collision. He had 40 in the spring of 2012, compared with 54 in 2010, 48 in 2011 and 51 in 2013.
"After coming back from my injury, I don't think I had that many at-bats in the spring and I felt good going into the season," said Posey, whose batting average dipped from .336 in 2012 to .294 last year. "But there might be a year where you want a few more. There's nothing set in stone."
Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. This story was not subject to the approval of Major League Baseball or its clubs.