Originally Posted by wpoll

Short answer - yes. A week of very short runs like this will leave your battery gasping for a charge.

My drive to work is 10km (6miles) and my engine barely gets up to full temp, esp. in winter. 10km home again each day gives me 100km per week with 10 starts per week. Actually it's more, but you get the idea.

That works out to one start per 10km (oddly!) and that's not enough driven distance per start to keep the battery fully charged. By Friday, I'm seeing the terminal voltage drop a lot when I start the car (as indicated by the DSC 4x4 lamp lighting when I turn the car over). I don't know what driven distance is required to recover from a start but it's probably more like 20-30km per start.

Your driving cycle is a similar daily distance to mine, so I'm pretty sure you'll see the battery being depleted by the end of the week.

In the winter, when I run headlights, rear window defrost and heaters etc. everyday I trickle-charge the battery every weekend.