1997 Pontiac Bonneville A Problem

Some of the national brand autostores make house calls, if you have a store in your city. Where needed, they will replace your battery right there in the driveway. I don't know what they charge?

Use a digital multimeter leads across the battery posts, voltage setting, everything turned off. The generic spec for a full charge is 12.6 volts. Leave the leads where they are, have helper turn key to crank, watch the voltage reading, should drop some but not below around 9 volts. With the vehicle running, we can check the charging system also. I wouldn't replace anything without testing.