How Central Venting Works

Information 

• State-of-the-art batteries have central venting -A-  .
• In certain battery states, the gas produced during charging can emerge centrally through an opening on the upper cover side. Backfire protection is integrated at the same position and prevents the combustible gas in the battery from igniting. 
• On batteries with a vent hose -A- , check that the vent hose is not disconnected or pinched. Only then can the battery be freely vented. 
  Fig 1: Identifying Central Venting

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.