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I have a 2005 grand voyager I found the required battery that fits in the tray is double the cost of same size battery as it has high output The big problem is so much electric gadgets such as electric doors ,tail gate ,seats etc and the amount of interior lights suck the power Imagine you pull up with all your family on board apply park brake engage neutral switch off engine ,then both electric doors open then all the interior lights come on then you close the electric doors ,open the tailgate to get the bags out lights come on again close the tailgate and then operate the locking system ,well since you stopped the engine you used a fair bit of the stored battery power and the electronic moduals will still be "dozing off " and will use a bit off power in stand by mode till you unlock the car again So when you start up you have a battery that is less than 75% when it needs to be close to 100% I got fed up with getting the jump leads or the boost pack out so I fitted a second battery and some electronics now I have a slave battery that fits nice behind the right panel at the rear of the car near the tailgate a cable runs to the front and when I stop the car the relays turn off the main battery and all runs on the aux battery when I switch on the key I'm connected to a fully charged main battery as the voltage rises after startup a split charge relay charges th aux battery