Tesla Motors Purchases Maxwell to Improve Energy Density Posted by Diadon Acs · February 04, 2019 Tesla's battery packs offer one of the best energy density for hours usage in the industry, but there's always room for improvement. It was likely this reason, the automaker just purchased a company specializing in battery and capacitor tech. Read more 0 comments Tags: battery capacitors scitech technews technology technology news tesla ultracapacitors