Audi A8L Doesn’t Start in Cold Weather – Charged Battery and Starts Right Up

Our 2006 Audi A8L sat for 2 weeks in 30-40 F, the engine cranked slowly and never started, the battery measured 11.8V. We charged the battery with 8A and within 2 hours, the battery went up to 12.9V and it started right away, great car.