Where is the battery located on a mercades benz b200

For a W245 Mercedes, the 2006-2011 B-Class: It's under the foot well, just ahead of the front passenger seat (on a left hand drive model). Under a cover with a 'latch' which you use a large coin to turn counter-clockwise to unlock. The fuse panel is also there, beside the battery.

USUALLY UNDER THE REAR PASSENGER SEAT,IT LIFTS UP AND THE BATTERY IS ON THE PASSENGER SIDE REAR UNDER THE SEAT. IS THE BATTERY DEAD? WHEN YOU PULL HEADLIGHT SWITCH ON,DO LIGHTS COME ON? IF THEY DO,IT'S NOT A BATTERY ISSUE. IF THEY DO NOT COME ON,THEN IT MAY BE DEAD BATTERY,BUT WHAT MADE IT GO DEAD? ARE THE BELTS ON YOUR ENGINE SUCH AS THE ALTENATOR BELT,OR DID YOU LEAVE THE LIGHTS ON OVERNIGHT? BATTERY MAY BE IN NEED OF REPLACEMENT.JUST TRYING TO SOLE YOUR PROBLEM OTHER THAN WHERE THE BATTERY IS.THAT'S WHAT I DO FOR FIXYA.COM OTHER THAN PROVIDING A SIMPLE SOLUTION AS WHERE IS BETTERY? I WILL GO THE EXTRA MILE TO ASSIST YOU AND TRY TO SOLVE YOUR PROBLEM IF YOU LIKE. IF YOUR BELTS ARE ON AND YOU DID NOT LEAVE THE KEY OR LIGHTS ON, I SUGGEST YOU HAVE THE BATTERY AND ALTENATOR CHECKED FOR FREE AT ANY AUTOZONE,OR ADVANCE AUTO PARTS STORE. THEY BOTH OFFER FREE TESTING OF BOTH AT NO COST TO YOU. AND BOTH OF THESE STORES WILL PRICE MATCH,IF YOU FIND IT AT ANOTHER PARTS STORE,THEY WILL MATCH THE STORES PRICES. THEY WILL NOT INSTALL ANY PARTS OTHER THAN THE BATTERY HOWEVER THANK YOU FOR CHOOSING FIXYA.COM AND I LOOK FORWARD TO ASSISTING YOU IN YOUR FUTURE AUTOMOTIVE NEEDS!