Agree !!

And as Greybeard stated...you had consistent diagnoses from several sources. So, unless all the gages were calibrated to provide false readings, I'd say you're ready for a battery (but do what Crazycarkid suggested and drive at freeway speeds for a couple hours and return for another reading, FIRST).

 

typically batteries last 4 or 5 years. consistant results of 220 cca's and a 4 year old batt means you will need a battery before next winter. cold weather is a true test for a weak battery.

 

If you have four years on that battery, your probably on borowed time with it. You can push it for some months until it strands you somewhere, or pre-emptively replace it now. If it were me, I replace it now. I hate being stranded. Come to think of it, my 2007 HHR is over four years old. Guess I need to think about replaceing the battery in mine too.

 

We test batteries with resistive load banks for large standby power systems, but the principles are the same for cars. So as long as you can find a measurable load to place upon the battery, you can perform a battery test yourself. (Measurable loads can be a 12V hairdryer, a couple of sealed beam headlights, etc, but must be resistive). Optimal temperature is 77F, but there is a correction factor for lower temperatures.

For the testing of any battery following data is required:
a) Current Rating - in Ampere Hour.
b) Voltage Rating - in Volts.

Suppose a battery of rating 40 Ah of 12 Volts. You connect the measurable load of 40A to battery and take the voltage reading. The voltage should remain constant under load and under no load conditions. The multimeter needs to show constant reading. The given test is not more than 5 seconds in duration. If it is not showing constant voltage, the battery may be not in full charge condition or may be subject to manufacturing defects.

 

The battery in my 02 sunfire lasted 8 years. i just replaced it last fall