Audi Q7 no crank

[Shimstar]

Hello all, I have a 2012 Q7 3.0 TDI auto (CRCA) only 72k on the clock. I did some work to replace the drivers wing, upon completion I lowered the jack a tad to fast which caused the alarm to go off. Prior to this the car started but now upon turning the key to first click the fan turns on but I get no crank?? All lights and MMI come on, the steering unlocks but nothing at all. I did get a low voltage on the battery message come on the dash. When using a booster or a trickle charger I had no joy. My autel is showing 11.3 volts at terminal 15 and 30. I tried a new battery but no good. I'm thinking it's a relay of some sort. Any advice much appreciated.