[mman1506]

Originally Posted by pnitin

Actually what I am trying to say here is if you treat your battery well, it will serves you faithfully, if you abuse it, it will not serve you well. Momentary drops are called spikes and most of the filter will take care of it ( you will not see brown out for spikes) I think problem is when you want to start with 9V battery to begin with, you have problem.

That way CTRE chart is incorrect since no one ( sane person) will be turning on robot with 9V battery level in competition.
what you really want to see is how well they handles those spikes.
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Are you trying to say that the SD540 looks at an average voltage reading rather than a instantaneous reading so current spikes would not cause it to brown out? Thus making a low voltage cut off to protect you from draining the battery below a 9v state of charge?