Buick 2010 Lacrosse Owner's Manual page 361

Do not use the compact spare on
other vehicles.
Do not mix the compact spare tire
or wheel with other wheels or tires.
They will not fit. Keep the spare tire
and its wheel together.
If the battery has run down, try to
use another vehicle and some
jumper cables to start your vehicle.
Be sure to use the following steps to
do it safely.
Batteries can hurt you. They can
be dangerous because:
They contain acid that can
burn you.
They contain gas that can
explode or ignite.
They contain enough
electricity to burn you.
If you do not follow these steps
exactly, some or all of these
things can hurt you.
The jump start positive (A) is
located under a trim cover in the
engine compartment on the driver
side of the vehicle.
This post is used instead of a direct
connection to the battery.