i just replaced the battery to my 2008 LS600hL myself with the top of the line replacement battery from Auto Zone designed specifically for this vehicle. It cost me about $130. And it has a 5 year warranty. It is not difficult to do. AND if you drive your vehicle to Auto Zone, they will pull out your old battery and drop in the new one for you at no additional charge. In fact, they will give you some credit for recycling your old battery.