I have a 7.2v 6800mah Li-ion battery. I would like to get a regulated 6.7v (or very close) out and draw about 870ma. Could I use a LM2940T 5volt fixed output with a resistor (size ?) on the ground pin to maximise output as the dropout of 0.5v is all I need? If so, what size capacitor on output? Is there a better way to achieve this?