Told a customer I couldn't refrigerate his battery and he did not take it well

I worked the counter at a battery and alternator shop for a few years and we got our share of these. My favorite was a guy who showed up with a cooler in his trunk, ice packs alredy in it, beacuse he'd read that a battery 'only shows its true self' when it's cold. He genuinely expected us to run the load test with the battery sitting in the cooler between the ice packs. When I told him the tester clamps need clean posts and a battery sloshing around in meltwater doesn't give a reliable reading, he accused us of using the room temp excuse to sell people new batteries.

The funny part is his own logic didn't even hold togehter. If you wanted a real cold number you'd need to actually get the whole cell down to temprature, not just chill the case for an hour in a cooler. That's why the testers apply a temperature correction to the reading. Nobody hides anything, the math already accounts for it. What I learned from those years is that some people come in with the conclusion already written and they're just shopping for a test that will confirm it. The ones who bring thier own ice are beyond reach. The ones who just ask a lot of questions usally turn out fine once you walk them through what the tester actually does. Your coworker shold wipe that door handle down though, batteries have been in some places.

I kind of get where that guy was coming from, even if the plan was ridiculous. Years ago my Corolla would crank slow on winter mornings but test fine at the shop every time. So one weekend I pulled the battery, let it sit in the house overnight, and took it in warm, thinking the cold was masking a real problem. The tester said the battery was healthy, and it turned out the actual issue was a corroded ground strap on the starter. Took me two more trips to figure that out. Point is, I wasted a whole day chasing a theory instead of letting the shop do the simple test first. Now I just tell people the cold cranking number is a rating, not something the battery hides at room temperature. If it starts fine warm and dies cold, the answer is almost never the test conditions, it is either the battery getting old or a connection problem somewhere else. My neighbor was convinced his truck battery was bad for two winters because of exactly this thinking, and it turned out to be a loose terminal he could have fixed with a wrench in five minutes.

I'm with you on the temperature correction point, but I'd push back on one thing in that second reply. The guy in my story didn't test fine and still blame the cold, his battery was actually on its way out. I pulled it after he left and it read maybe sixty percent of what the label claimed, warm bench, tester doing its normal thing. He just didn't belive the number because it wasn't the one he wanted. So yeah, some of them are chasing a fault, but this one was chasing a feeling. He'd already decided the battery was good and wanted the test to agree with him.

This reminds me of my neighbor who keeps his spare battery in the garage fridge next to the beer. Swears it 'keeps the charge fresh.' I gave up arguing and just told him it's his fridge. What I want to know is what the original guy thought the shop fridge was going to prove anyway. Even if it got cold in there, it's not like a car battery sitting next to a lukewarm ham sandwich is reproducing a January morning under the hood.

Reminds me of when I tried to settle a similar arguement with my brother-in-law. He swore our deep cycle was weak, so I borrowed a proper battery tester with a built-in temp probe and we tested it cold, actually cold, right out of the garage at 5am in January. Reading was fine. Killed that theory dead. The probe mattered more than the tester honestly, because before that we were just guessing at what 'cold' even meant. Honestly the fridge plan is funnier though. A break room fridge, with the door barely closing, is going to be lucky to hold 40 degrees in the middle. The parking lot idea at least had the right spirit.