Got my battery installed today only second part of my ongoing stereo install my old durlast gold 58 dlg would drop into the 13s with the ac/headlights/pioneer avh5600 going with the new d6500 the lowest I saw it drop was down to 14.11 @ 500 rpms idle, with the engine @ 2000 rpms and everything on I'm at 14.29 on stock wiring I'll be doing big 3 soon though.