Huh? The equipment does not "take" or "draw" anything. The electrical pressure
of the source, called voltage, forces electrons through the load. Electrons per
unit time are called current. The current is only limited by the resistance of
the load, in accord with Ohms Law. The resistance of the load acts as a valve or
choke point in the circuit, thus limiting the current. In the case Allan
describes, the battery is the primary resistance in the circuit. If the battery
was large enough and, or, sufficiently discharged (low resistance), and the
source could provide enough current, the C-40 would "Toast".

Dick Ratico

--- You wrote:
Because it is not 80 amps current flowing, it is a capacity of 80 amps.
Think of it this way. Your toaster is plugged into an outlet that is
powered by the grid. The grid has infinite capacity. Why doesn't your
toaster explode? Because it takes the current it needs. Now, increase the
voltage and you may have a runaway current situation, but at the design
voltage the equipment takes the current it needs up to the limit if the
supply.
--- end of quote ---

