my 2014 cadallic srx draws the battery down in 3-4 days if not run. battery is
18 months old and holds a charge for 3-4 days without car connected. I can
find no amp draw when i checked for drain with an amp meter.
Battery might be defective; maybe a dead cell. A bad alternator will not keep a good battery charged and if it doesn't, you could drain down in four days or less. You checked for draw, but did you do this properly? If battery and alternator are good, you might have a parasitic drain in one of the circuits that can be difficult to find; even with a multi-meter. Go to a car parts store and have battery & alternator checked, probably free. Then you'll know where to start.
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