Mercedes-Benz 350el electric mode is not available in cold weather.

Does the subject want to ask "the reason why the electric mode of Mercedes-Benz 350el is unavailable in cold weather"? The battery activity decreases and the power system fails.

1. Reduced battery activity: Due to the cold weather, battery activity will be reduced, resulting in reduced available battery power.

2. Electrical system failure: The electric mode of Mercedes-Benz 350el depends on the complex electrical system. The failure of the electrical system, such as motor failure and circuit failure, will also make the electric mode unusable.