I guess your engine is not starting as the battery is dead. Use a jumper wire to start the engine. Drive up to shops that sell car batteries. There are so many of them around Doha. There are several of them on Salwa road coming down from Ramada signal towards Mid Mac R/A after the round-about. There many shops in Siniyah wher you could find one. The shopkeepers will let you have the exact replacement. There are several brands available in the market and AC Delco is a good brand. Most car batteries come with a one-year warranty which you can get from the shopkeeper when buying one.