My sister-in-law just got a 2003 9-3 arc turbo. I am a little bit of a car guy, but have never seen the inside of a Saab before (or underside or underhood) and I am impressed with it. However, the 2-yr old saab battery won't hold a charge now, and I notice that it has a vented compartment and what looks like removable caps on top of refillable cells. I am surprised to see that. I thought all batteries were maintenance free now. Why does Saab continue to use the old style ?