Cost $130. Local Interstate distributor wanted $121 for battery only (MTP-93), including tax. MB dealer wanted $130 + $110 labor + appt, but suggested that I call RA that my battery needed a jump, and then ask for replacement instead. It's not a real complicated install, but I'm glad I had RA do it, at least the first time. Plus didn't have to leave my house, no lifting, MB warranty.... Seems like a deal to me.

BTW, mine was original in a 99 ML430, so lasted almost 7 years. I'm told 4-5 is average.