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Why would my battery charger indicate the voltage is too low to charge while the battery is in the car, but when I take the battery out, it charges fine on the same battery charger without showing any faults?
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Most car batteries these days are of the SLA (SEALED Lead Acid) class, so there's no checking things like fluids these days; it's dead once it stops working right. If it's charging fine on the external charger, it could just be a tired battery that fails under a load but works when off load. It's not a common failure mode but it happens.
The first thing I would do is check the terminals for battery acid and if you see any, clean it off; same for the battery. If it helps, sometimes the buildup can also cause this but generally, once they start outgassing it can sometimes mean the battery is just flat out on the way out. Put dielectric grease on both parts to avoid further issues, as well as any new batteries you buy moving forward.
If that doesn't help, get the codes on the car scanned and check for issues like a bad alternator; the alternator charges the battery. If the alternator looks good, it could be a wiring or ECU issue. The big thing to remember with the DMM test is to use a good meter; the alternator can blow out a cheap meter really quickly, especially barely qualifying CatII ones.
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The battery was purchased December 2022 and is a sealed battery. It was purchased from Walmart. After charging for several hours, I checked it with a volt meter and it simply would not hold a charge. I returned it and Walmart exchanged it without incident. The terminals were clean, tight and shiny. The alternator was checked and found to be fine. But thank you for your answer.
@pappy79280 also, for future consideration, oreilly will test batteries for free
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Have you checked your fluid levels in the battery?
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The battery was purchased December 2022 and is a sealed battery. It was purchased from Walmart. After charging for several hours, I checked it with a volt meter and it simply would not hold a charge. I returned it and Walmart exchanged it without incident. But thank you for your answer.
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The battery was purchased December 2022 and is a sealed battery. It was purchased from Walmart. After charging for several hours, I checked it with a volt meter and it simply would not hold a charge. I returned it and Walmart exchanged it without incident. Once the new batter was in, I used my volt meter to check the alternator and it was charging appropriately. This excluded the alternator as a culprit. The batter was in a 2017 Kia Sedona. New battery, everything seems to be working fine....so far. But thank you for your answer.
- de Pappy