Hoping it helps someone, sharing my experience of purchasing a car battery at Costco in Canberra. I bought an Exide car battery CMF55D23L from them. Because it was the cheapest in the market at ~$107 after discount. Hooked it up on the good'ol Camry. The car wouldn't start. Went to SuperCheap, tested the battery and the dude said cells were dead and the battery was useless. Got a Century battery from them. When I went to Costco to return the battery, I was surprised with what I had to face.
When I told them the battery was dead, the dude pulled out some sort of a multimeter and said it shows 12 Volts so nothing wrong with the battery. When I said the battery perhaps didn't have the CCA to start the car he was clueless what CCA meant. It means cold cranking amps, btw - "I can't measure something I dont know". I was told "battery cover says 12 V, the meter shows 12 V - not my problem". I can't quite remember if the battery label mentioned the CCA but I was already anxious.
Showed him the supercheap fellas battery test slip/report. He said, can you prove the test was for this battery? Then he actually asked why did SuperCheap not charge the battery when their meter showed the battery was faulty! While this should have been an indicator of what I was dealing with, still, I showed him a video clip of me hooking up the multimeter to the battery and the voltage dropping to less than 5 when cranked, still wouldn't believe me. I was making videos to find out if the alternator had gone tits up. Somehow, an older dude came by, looked at things and said "ah well, we'll refund"
All this anxiety and putting myself at risk (the (power) steering would stutter after I turned the blinkers on, the radio wouldn't let the blinkers turn on, etc) was just not worth it. Horrified at the return process with Costco. Been shopping there for years but never returned anything. Going by what I read, was under the impression it'd be a cake walk.
Also, almost no one installs the car battery for free. Not even Battery World. When I pointed them to what was on their website they said "Oh we are in the process of updating it". $30 to install isn't the end of the world, but doesn't hurt to know in advance. Repco doesn't install at all. SuperCheap at least extends the warranty by 3 months if they install it.
Thoughts and prayers 🙏