Started getting some of the XFire "quirks" that typically show up when the battery is low on charge. So I did some battery maintenance this weekend. Removed all the caps on the cells and checked the electrolyte levels. Shop Manual states that the electrolyte should be 1 cm over the top of the plates. There is a lip at the bottom of the battery cap hole that should have electrolyte covering it. If the electrolyte level isn't that high when you inspect, add distilled water to the cell. I had to add just small amounts to all of the cells to get to this reference point. (Note: As stated earlier in this thread, the Varta battery is labeled "maintenance free", but the Shop Manual clearly states that the XFire comes with a "low maintenance" battery. And as such, there is some routine battery maintenance required to prolong battery life.)

Then I put my battery charger on the Varta and did a complete charging of the battery. I don't drive the 07 Coupe enough or often enough to get the alternator to fully charge the battery. Took only about 3 hours to get to full charge.

Plan to drive the car the next few days & see if any of the charging system "quirks" surface again.