Car won't start. We want to check the battery, but can't find it. When we try to turn the key, the car does not turn over. Radio doesn't work, nor do the lights. This is a 2006 Model 3301 BMW

Try looking under the back seat.

the battery is in the trunk in a little compartment near the right rear wheel. Lift the cover in the trunk and there you go there's the battery. Be sure to get dealer only battery as these cars could be problematic if you decide to get one from your local parts store. If you can also try to boost your battery from under the hood directly. On the passenger side of the engine compartment there is a positive terminal under a plastic lifter.