No one has answered the OP's question.
The readings that they are giving you is a load test from the sound of it, the batteries normal volts should be 12.6V when you place a load on the battery, like starting the car the Volt reading should not go below 9V. If it does the battery is no good. If the battery is sitting at 12.6V and you apply a load and the V drops to 10.8V this would indicate that the battery is doing just fine.
+1, excellent response.
I just wanted to add, the battery in my 04 Grand Prix outlasted the motor. Changed the motor last summer at 180k, just changed the battery this winter at 185k, lol. Of course, maybe if I hadn't reset the oil light before changing the oil, then forgetting about it....