my 96 Civic hatch with a 94 GSR jus recently acted up.

i need help findin out what the problem is.

The car basically runs on straight battery and dies out after a few days of driving it. I figured it be my alternator so i changed it and it still dies out. So i then thought my battery is screwed so i bought a new battery and it still dies out.

wen it dies, i try jumping it and it would die out again after like a minute.

so im thinking it might be a bad starter or something. basically, i have a new battery and a new alternator and it still dies out as if the battery isnt getting charged. so yea, i was jus wondering if you guys would know what the problem might be.
thanks

 

Are you throwing any trouble codes? Is your speedometer acting funny at all?