Houston-based Fleetzero has successfully raised $43min Series A funding, led by Obvious Ventures with participation from a powerhouse coalition of investors, including Maersk Growth, Breakthrough Energy Ventures founded by Bill Gates, and 8090 Industries. 

MOL PLUS, the investment arm of Japan’s largest shipowner, Mitsui OSK Lines (MOL), invested in the marine battery maker two years ago.

Fleetzero, founded by two former American seafarers, claims its Leviathan battery is the world’s most energy-dense battery pack.