Originally Posted by
znomit
You should see 4.8/.7 = around 7hrs runtime at 700mA!
I believe OP is driving 4 LEDs at 750ma EACH.
So he's burning 3 amps per hour from a 4.8 amp-hr battery, for 4.8/3.0= 1.6. So it'll burn about 90 minutes by nominal values. Actually, its probably closer to 80 minutes if you factor in the driver conversion loss.
Later he's at 0.35A, then today at "full power" or 1.0A.
I think he'll soon determine his battery's true storage capacity....