Under driver's seat. You only need to remove the two silver triple-square bolts to "swivel" the seat back. You may have to remove the seat frame trim at the rear to keep from damaging it when the seat is tilted. There is an auxiliary battery in the rear on some models. It is used primarily for starting, while the main battery runs the electronics during normal operation. If your car is slow to start, it may be the rear battery that is causing it (if equipped). It would have to be isolated to test it properly. There are charging posts in the engine compartment, on the driver's side. The power steering reservoir sits between the posts. These batteries are expensive to replace, but six-seven years of working is pretty good as far as batteries today go. Depending on the mileage you've accumulated, the starter may be causing a slow crank as well. This is quite an endeavor since the intake manifold must be removed to gain access. If the coolant pipes under the manifold have not already been converted to metal, do yourself and your wallet a favor and do them together, since a lot of the MaxiSYS Pro is the same. Good luck with it.