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Is there any difference in how long the battery lasts between an 18v battery and 24v battery.
About 25% more runtime. Runtime is a function of energy, and energy is capacity * voltage.
So a 18v 3Ah battery has 54 W*h energy, and 24v 3Ah battery has 72 A*h energy. 54/72 = 0.75, in other words 18v battery has 0.75x runtime of a 24v battery. Tools also run a little more efficiently at higher voltage, but at the same time as battery discharges, voltage drops and net efficiency gain is negligible. Depends on motor design tho. You also get higher RPM and torque.