Those are tough conditions for any battery to be used under since many accessories like aftermarket stereos have a continuous small current draw which will flatten batteries over months. I would use a plug-in battery maintainer if it was being stored indoors, and a solar charger if it is being stored outdoors. That way the battery never goes flat.
The best option for now is to trickle charge your battery overnite and see if it comes back. The stock battery may or may not.
The best option for now is to trickle charge your battery overnite and see if it comes back. The stock battery may or may not.