MacBook Air not turning on

I have a mid 2012 macbook air, i used to get service battery message on and off, like a moron i kept delaying to buy a new battery. last night i left the laptop on charge from morning its not turning on, no sound from the fans as well.

I have tires SMC reset, Ram reset, power cycle, holding the power button and plugging in the charger, nothing helped

I opened the bottom and noticed the battery is bulged, i disconnected the battery and tried turning on but nothing. when magsafe is connected its green with the battery connected and amber when the battery is disconnected.

during the SMC reset light blinks from green to amber when the battery is disconnected. With the battery connected SMC reset does nothing.

does that mean laptop is dead, would replacing the battery help?

thanks