car starts every 4,5,6 hours on 1990 Nissan Maxima

I bought this car recently. Soon after I bought this car, battery kept dying. So I replaced the old battery to new battery. Since then, once I start the car and once I stop engine( car key off from the car), the car will not start for like 4-6 hours. and the car year is 1989 not 1990.

Asked by for the 1990 Nissan Maxima
Sounds like you have an electrical draw? You should take it to your mechanic to see what is causing the problem?