As Aser says, it really depends. If I was at night, I would want some battery for the landing light when I get down, and panel lights maybe. If I was in 'Class B' I might choose to keep the transponder on. If I was in low vis, then maybe the strobe would stay on.
Radio Transmit draws a lot. So does the landing light. The other equipment draws little. The situation would dictate how you use your remaining supply.
As the POH says 'Land as soon as practical', I would think there would be enough for about 10-15 miles of flight. But that is a COMPLETE guess.
Maybe a techie can answer this.
cl12pv2s