Originally posted by: Modelworks
It isn't the battery. Its the PLL circuitry on the board.
Some boards don't even use the battery at all unless the power is removed from the PS.
This is a picture of the areas the could be at fault using a abit ab9pro as an example. Ignore the fan controllers, pic was for another users question.
http://i39.tinypic.com/357q44g.jpg
The areas on your board at fault are the quartz crystals which can be in many forms from the cylinder type to the type in the can on the picture.
There isn't anything you can do about it and it could get worse over time. Crystals are normally well tested but like everything , sometimes bad one slip through. It could also be other parts between it and the real time clock.
RMA the board while you still can.