BMW Repair: 1999 328i wont start, battery terminal, riding the bus

Question
1999 328I  (VIN FR08027) AUTOMATIC , I HIT A CURB  A MONTH AGO , MY AIRBAGS , DRIVER  SIDE (DOOR) AND CEILING (DRIVER SIDE) WENT OFF , I TRIED TO START THE CAR BUT NO LUCK , I HAD IT TOWED TO MY HOUSE , AND ITS BEEN SITTING THERE SINCE. THE RADIO WORKS, LIGHTS INSIDE WORKS, , BUT I CANT GET IT TO START , THE ENGINE WONT CRANK , I ONLY GET A CLICK , NOTHING.
AFTER I SEARCHED ON THE NET I CAME ACROSS THE SAFETY BATTERY CLAMP, I LOOKED AT IT AND YES IT WAS DISCONNECTED ,I CONNECTED AGAIN  AND TRIED TO TURN THE ENGINE  ON AND SURPRISE NOW I GET THE SOUND  LIKE THE CAR WANTS TO START BUT NOT ENOUGH POWER , I JUMPED STARTED AND STILL GOT THE SAME RESULT ,STILL NOT ENOUGH TO TURN THE ENGINE ON, , I'M THINKING MAYBE I NEED A NEW BATTERY , , PLEASE  HELP ME OUT I'M DESPERATE TO  GET MY CAR BACK TIRED OF RIDING THE BUS AND TRAIN!
ALSO I WAS TOLD TO PRESS A BLACK BUTTON UNDER THE HOOD BY THE BATTERY TERMINAL AND I SHOULD BE OKAY BUT NOTHING  CHANGED AFTER I DID  IT.

Answer
Ben, If the battery saftey terminal has been deployed then it needs to be replaced. If the battery voltage is low, doesn't hold a charge, or fails a battery load test. You can remove the battery and take it to a Commercial shop and have is load tested. Again replace BST if deployed.
-Evan