The ESS system looks for a voltage difference between the main battery and the small auxilliary battery to determine whether the Start/Stop system is functioning correctly. Since our system does away with the auxilliary battery, that voltage difference doesn't exist. So, after 6 ESS events, the feature is disabled and will show a warning to service the stop/start system. This is of course a redundant warning since it is predictable and explained by the elimination of the small auxilliary battery. That cycle resets each time the vehicle is turned off and back on. The minimal drain from the few seconds spent at a stoplight is quickly replaced by the alternator while driving.