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BLESS!
I believe that I need a battery for my 2005 Silverado LS. I'm trying to find out which is the best recommended battery for it. I know that Chevy itself uses ACDelco, so I'm trying to find out which of those to buy, please (Gold, Gold AGM, etc).
At times, it can be a little difficult to crank. My other 1/2 was driving it one day and was given this now usual problem. Someone (I believe at a dealership) checked it out and said that the alternator was good. There was also an offer of $8K for the truck, LOL. The engine is great!

 

If you are unsure of the "goodness" of the battery, stop into most any auto parts store and they will test the battery for you for free. They will hook up a handheld tester that will test several aspects of the battery in short order and it will let you know if the battery is good, marginal or in need of replacing.

Unfortunately, as far as testing the battery under an actual load, it cannot do that. To test a battery under load (in other words while a large current is being drawn from the battery), requires a load tester which will draw 100 - 250 amps for 10 to 30 seconds. If the battery maintains a certain minimum voltage for a specified period of time (like 15 seconds), then the battery is considered to be good.

The handheld battery testers used at many parts stores tests the battery by sending an alternating current signal through the battery at a specific frequency, and then the microprocessor inside the handheld tester determines the overall health of the battery.

Regarding a replacement battery, you will want to get a a top tier battery especially if you live in a colder winter climate zone where the temperatures can drop below 30 degrees F, Most auto part stores sell three levels of batteries, Good, Better, and Best. As you go up the "ladder of goodness" so does the capacity of the battery and the length of the battery's warranty. Also, the cost of the battery goes up as well.

Since you have a 2005 Silverado, I am going to assume that it has a 5.3L V8 engine in it. In that case, you will want to get a regular, lead acid flooded battery with a Battery Group Size of 78 and a Cold Cranking Amps (CCA) rating of 650 or more.

If you do need a new battery, my advice is to go to Walmart and purchase one of their EverStart MaxxLead Acid Group 78 batteries which sells for about $140 with exchange (you take in your old battery and they recycle it). This will likely be the same battery as the ones sold by AutoZone (as their Duralast Gold) or Advance (as their Diehard Gold) and equivalent to O'Reilly's Super Start Extreme or NAPA's Legend Premium batteries. It also comes with a 3 year 100% warranty.

Note - there are only 2 or 3 battery manufacturers left in North America and the batteries they produce are extremely similar. The biggest difference between batteries in a given Good, Better, Best category is the brand level that is slapped on them. Walmart gets their batteries from the same manufacturers that the auto part chains get their batteries from.

Good Luck!