The battery in our SUV also died over the weekend...last weekend. Marlin tried to go to work Monday and it was dead. He finally bought a new charger and we are charging it now. The battery on my riding lawn mower went down during the winter. We got it started this afternoon and I mowed the back yard. Hopefully, we will get the Ford started tomorrow.I don't know what is essential is either. My Truck Batterie keeps going dead. I don't know if something got left on or not. Batterie is still is under warranty so might have to make a trip down to Les Schwab...always something.