Spare Parts

Recently, my battery died, so the GM dealership kindly came to pick up my car and take it to the shop.

Usually, when you get your car fixed in Thailand, the shop will give you the old part to proved that they actually did something - like the battery, a fan belt, or even the empty bottles of motor oil. 

This time along with my old battery, my car came back with a large metal piece.  I've still no idea where it came from, what it does, or how it's related to a battery.  I'm a little nervous because it's big enough to look important - like holding the frame onto the chassis.