The wattage used and the low voltage cutoff determines battery amp drain rate as long as the result doesn't exceed the power devices input amp limit.
The amps displayed on the screen are output / from the 'chip' to the delivery device, that doesn't relate to input / from batteries to chip.
Just me, I tend to be conservative, 100w - 120w from a 2 cell power device using 20a CDR cells is about as high as I go.
Some folks use power settings above that, we all have to set our own comfort zone / saftey limits when using the cells we use.
yeah ive gone up to 60w now this is all the screen tells me. it has a low voltage cut off point not sure what it is cant find the answer
online.