The spacing between the cells minimizes the chance of a multi-cell cascading fire. I think they also changed the charging controller to better monitor the batte

The spacing between the cells minimizes the chance of a multi-cell cascading fire. I think they also changed the charging controller to better monitor the battery status and charge/discharge current. Changing the controller was part of the "fix". I'm guessing at some point, they'll make a change to the Lithium cell chemistry for enhanced safety. Changing the chemistry of the battery, and controller software updates is the real fix. The rest is just failure mitigation.