Starting up

My car don't seems to start up, it shows a battery problem but charged and still didn't start up. It shows oil leak but add a little oil still didn't do any good. The oil is still good. When I usually start up the car. Its like its going to died and it have couple of times. I messed with the battery and it started up again. But this time it just wont start. The radio, lights all work but when I ignited it, u hear it crank just not like "rhmm"( normally what u hear when you start up a car)