My girlfriend went to Mike's Auto Service in Union Square in Somerville to get a battery replaced. Initially Mike told her it would cost $90. After they finished the work they called her and told her it would cost $215. When I called Mike to politely ask how he came about these costs and charges, he immediately got angry and defensive. He told me that a new battery for a 2002 Altima costs $99 and that labor to install the battery costs $73, plus $30 for testing the alternator and charging the battery. The remaining costs were due to the disposal of the dead battery and taxes. After asking what type of battery was installed, he said he did not have time for me and hung up the phone. I have called numerous body shops in the area and have found that the average cost to purchase and install a battery in a 2002 altima costs $75. A complete rip= off and a joke of an autobody shop!!! I have filed a complaint with the BBB and plan to tell everyone I know in Somerville about this experience.