I have a 2003 C320 and I just started getting a warning light saying battery low.

It started after the weather turned cold this week. The battery is in the trunk, but when I look online at the battery choices they all say, Must be vented to the outside!

The one in the trunk is a MB factory battery but it doesn't look vented to the outside. This is the first car with a battery in the truck for me. I did have a VW once and the bettery was under the rear seat.

Any suggestions on the replacement and the venting.

__________________
1998 Land Rover Range Rover 66K Miles
1988 300SE Totaled in 1998, hit by drunk driver, but we walked away OK
1989 420SEL 140,000, just warming up. Total by 18 wheel gas truck rear ended, but refused to lose another MB. Had it repaired cost $10,000+ Great Car again SOLD it for a 2003 C320 to save on gas
1991 2500 Suburban 454, 130,000, Best truck in the world. SOLD it out right.
1952 8N Tractor 1,000,000-/+