This is part of an article for porsche I found, it is regarding a $1700 lithium car battery they began offering a couple of years ago. As you can read they have a few problems below 0 degrees C. maybe the previous press release for Mphase is related to this problem?
The lithium-ion battery has the same length and width dimensions of the regular battery, but is approximately 2.8” or 70 millimeters lower. The fastening points, electrical connections and voltage range are fully compatible, allowing simple and quick replacement of the standard lead battery, for example when racing on the track.
The cars are delivered with both batteries and are ready for use throughout the whole year. The lightweight battery offers a very high standard of everyday driving qualities but its starting capacity is limited at temperatures below 32 degrees F or 0 degrees C, due to its specific features.
Market Data 
Markets 
AI
