So what’s under the hood? The engine right? Yes and a little more. The high voltage battery pack on the 2013 Mercedes Benz E400 Hybrid is the battery is behind the front strut tower. In the pictures below, one shows the battery cover and with the battery covered removed. The high voltage orange cables are very close to the right fender. Keep this in mind if you are making an relief cuts for a modified dash lift. The 0.8Kw Li-Ion battery pack operates at 120Vdc.