ABS and BAS lights on.

Both lights have come on recently. I note if I start the car with the parking brake off they don't come on immediately but will in a short
period of time after starting the car. The do come on immediately when the parking brake is on when starting the car. I have a C230 1998 MB. The book indicates these lights could come on when voltage is below 12V. I wonder if my battery might be heading south as the cause. Any other ideas? The brake wear light hasn't come on yet but I suspect my brakes are due to be replaced pretty soon now. They appear to be about 1/2 worn the last time I looked at them. Thanks for your input.
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