Car Battery Draining Overnight in Dubai Heat? Parasitic Draw Causes & Fixes

Underhood temperatures in Dubai summers frequently exceed 75°C. Excessive ambient heat evaporates battery electrolyte fluid, causing internal plate sulfation and sudden battery death.

What Is a Parasitic Battery Drain?

When you turn off your ignition and lock your car, control modules should enter sleep mode within 10 to 15 minutes, drawing under 50 milliamps. A stuck relay, shorted aftermarket dashcam, or failing door lock module keeps ECUs awake, draining your battery overnight.

Why Modern Luxury Cars Require Battery BMS Coding

Replacing an AGM battery in a modern BMW, Audi, or Porsche requires registering the new battery with the Battery Management System (BMS) so the alternator adjusts its charging voltage curve appropriately.