Battery dies after sitting a few days

thebozetheboze Member Posts: 2
edited February 2016 in Chevrolet
Has anybody else had this problem? I bought this 2014 Tahoe LTZ last April as a GM certified used car with 31,000 miles on it, I know have around 38,000 and a few months ago for first time I left the truck sit for 3.5 days and went out and the battery was down where it wouldn't turn over, miles were at 35,400 I though maybe I left something on, so I used my jump box it started and was fine, until about 4 weeks ago I left it sit for 5 days and same thing, wouldn't start. Now the mileage was at 37,700 so I took it to the dealer and after charging the battery, they told me that the battery was bad and needed to be replaced. I was also informed it was not covered under warranty because it was a maintenance item not covered by the extended warranty and was past the original 3 mo/36,000 mile coverage. I filed a complaint with Chevy, and they wouldn't do anything . I replaced the battery and last week I went away on vacation out of the country and when I got home after sitting in my driveway for 8 days, it didn't even have enough power in it to unlock the doors. So obviously it is not the battery, does anyone know of similar problems and know what was done to fix it?


  • thecardoc3thecardoc3 Member Posts: 5,612
    A parasitic drain can cause the symptoms that you have reported, it can also cause a battery to fail (sulfate) since the battery while it can have enough energy to start the engine ends up in a constant state of discharge.

    The first thing to do right now is get your new battery back up to a full state of charge and that takes all night with a full battery charger. Two hours with a heavy duty charger only restores the battery to about 50% of the reserve capacity. Testing for a parasitic drain is done by measuring all of the current being drained from the battery at rest. 30ma or less is the normal expected drain, anything more than 50ma is an issue. It can take up to twenty minutes for all of the modules on the car to go to sleep, so this testing can take some time.

    Once a drain is confirmed the circuit affected has to be identified. One routine requires an extremely sensitive voltmeter that can measure accurately into the microvolt range. The circuit with the drain will have a measurable voltage drop across the fuse that protects it. Testing from there depends on what is found during the investigation.
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