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So all of us MKZ hybrid owners who are unfortunate have come to the realization that the OEM 12v battery that came with our cars were too small and underpowered to survive the rigorous demands of our heavily electronically focused cars. I'd like to refer to the Fusion Hybrid forums because they discuss this in great length here. So I've been having issues with the 12v battery on my MKZh for the past couple of months. I've been able to keep the battery alive by jumpstarting it every now and then. i came back from 6 day vacation without driving it and now the battery is practically dead. jumpstarting it won't power on anything unless AAA jumpstarts it with their 1.5k Amp jumpstarter. Afterwards I make a trip to Sears. They recommended me a Diehard 96R battery here. It has 590 CCA which is much better than the stock Motorcraft battery with 390 CAA and it was already on sale so I purchased it. The Sears technicians try to install the 96R but find its slightly too large to fit into the tray so they put back the Motorcraft battery and I leave with the 96R. I've read on the Fusion Hybrid Forums that you can cut off the backend wall of the battery tray to accommodate larger batteries. Seeing as the Fusion hybrid is pretty much the same car as the MKZh I figure I attempt this. A member on the FFH wrote a guide here. Anyone have experience upgrading their MKZh batteries ? What tools used to cut the tray?