Tesla Inc. still hasn¡¯t figured out how to overcome manufacturing challenges that threaten its viability as an automaker, with glitches on the battery line pushing out production targets for the Model 3 sedan.

The company won¡¯t make 5,000 units per week of its cheapest car until sometime in March, three months later than planned.

¡°I have to tell you I was really depressed about three or four weeks ago,¡± Chief Executive Officer Elon Musk said on a call with analysts Wednesday after Tesla reported a record quarterly loss and cash burn.