If it's that new. Call your dealer or Shorai about a Warranty Claim. Info is on there site.
New they should be 13.5V + out of the box.
First try is the weakest.
Crank for 8 seconds,
Wait for 30 seconds,
Try it again.
This works 95% of the time when it''s 40F and colder to fire of an 950 sitting outside at camp overnight.