Baja-D is correct. When ESS is active, the secondary battery is there to keep consistent voltage/power to the electronics during ESS engine stop/start and thusly support the main battery when the ESS system requires the starter to engage. Phil C. 2020 GC Summit 3.6L 4x2. 2011 Kia Optima EX-L ("MC") The battery in a 2012 Jeep Grand Cherokee is located under the hood, near the front of the vehicle. It is usually easy to spot, as it is often a different color than the surrounding engine components. In some cases, the battery may be located in the trunk of the vehicle. Most vehicles simply need to pop the hood and connect some jumper cables Jeep Grand Cherokee Battery. Your Jeep Grand Cherokee battery will usually last between 3 to 5 years, but that can vary heavily depending on battery size, weather conditions type of battery, and driving habits. Even still, just because your battery isn't entirely dead, doesn't mean it's operating accurately. Part Number: BBAH7800AA. Vehicle Specific. Other Name: Battery Storage. Replaced by: BBH7A001AA. $282.41 MSRP: $328.00. You Save: $ 45.59 ( 14%) Check the fit. Add to Cart. Fits the following Jeep Models: The IOD connector can be used by the vehicle owner as a convenient means of reducing battery depletion when a vehicle is to be stored for periods not to exceed about twenty days (short-term storage). Simply disconnect the IOD connector from the JB receptacle slot # 15 and place it in slot # 11 (see diagram above). Battery Vent Valve. I replaced the battery yesterday on my 2018 Jeep Grand Cherokee Overland 5.7 V8. While taking the vent tube off the battery I broke the nub off the exhaust valve that connected directly to the battery. In the attached image you can see the part and on the right side was the part the broke (it directly inserted into the battery). How to Replace the Jeep Grand Cherokee “Fixed Key” Key Fob Battery (2005, 2006, and 2007) The Jeep Grand Cherokee is an incredibly popular mid-size SUV that first debuted in 1992. Grand Cherokees use a unibody chassis, unlike most other SUVs that feature a body-on-frame design. Keep reading for a step-by-step guide or scroll down to see a As a pioneer in the mid-size SUV category, your Grand Cherokee continues to perform at the top of its class. Don't bring down performance with a stock battery. Upgrade to an AutoZone Jeep Grand Cherokee battery and enjoy bolstered power that includes higher cold cranking amps to facilitate start-up in low temperatures. It's still a 12v AGM battery with a fully charged voltage of about 12.8 volts. If it always charged over 14 volts, it could cut battery life, even over-heat it. 12.3 is quite low, though, and on a battery with no load, indicates only about 60% state of charge. If left that way they won't last long. Jeep Grand Cherokee Dead Battery Symptoms . If your Jeep Grand Cherokee has a dead battery, there are several symptoms that you may notice. The most common symptom is that the engine will not start. Other symptoms can include the headlights and taillights not working, the power windows not working, and the radio not working. Zkom6x.