Elon Musk claims Tesla's battery modules are no longer necessary, and hints that cell to pack technology could be the future of batteries. This lines up with an October 2019 "aggregated battery system" patent filed by Tesla Cell Engineer Kevin Matthews. Additionally, Tesla is rumored to be working with CATL on a new battery supply agreement. In late 2019, CATL announced new cell to pack technology that greatly reduced the cost, complexity and increased the energy efficiency of its batteries. My guess is, Tesla will announce a redesigned battery pack without modules at April's Battery & Powertrain investor day.