09 GX470 no start/all electronics dead: any advice much appreciated

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Joined
Jan 16, 2023
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3
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Location
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Background: Car is super clean, zero rust vehicle only driven in desert southwest, always garaged, 130k mi, 6months old new high quality battery fully charged both on and off the vehicle. No mods, all stock other than suspension/wheel/tire swap ~7 months ago. Up to this point it has started & operated perfectly every time it was driven. All pos/neg cables are in good condition and contacts/posts have been cleaned. It is always garaged and has been sitting in my garage for last 2 months without being driven. No water intrusion possible.
Experience: I get in the car and it doesn't start, doesn't turn over, fully dead, no lights, etc. I assume battery is dead so I hookup a good charger overnight. I do note that there is some greenish powder on the battery posts but not extensive. The next day after charging I attempt to start vehicle. There is no noise whatsoever when I try to start. Checking electronics, there is a slight flicker of the dash lights and i get the headlights to go on briefly but no start, no ignition, no noise, no clicking, etc. All dead. I remove battery, clean all contacts, cables look like new, ground looks good but I unscrewed it and cleaned it. etc. I am thinking it must be a fuse or something fundamental because a problem with the starter would likely not result in 100% electrical failure. Is there a common electrical culprit with 470? I've checked a few threads on this site and nothing seems relevant, though maybe I missed it? Thanks in advance for any solution/advice.
 
Thanks OG-Z. Possibly could be a bad battery though that would be disappointing as it is basically new. That is my next step. Update. I put it on a more powerful charger. Hooked it up and got inside. FOB locked/unlocked the car and the dash lights worked sporadically. Turned the key with no response. Can move the electric seats very very slowly. Also, when I locked the car a voice I've never hear in the car said "good bye"....I am in good health, take no meds and have no known psychological issues. I have never had that car say anything/didn't know it had any kind of voice feature. ???...
 
You need to test the battery - with a battery tester. A bad connection or bad battery will cause also sorts of issues.
 
Brought the battery and the charger to the shop and the battery charger was bad and so was the battery. The new charger was telling me the battery was fully charged when it was in fact dead. I will try another brand charger but first get a maintainer. Replacing both and then need to figure out if I am losing an unusual amount power somehow when sitting in the garage: I incorrectly thought 2 months wouldn't drain a battery this much.
 
Duracell Gold 27F battery and X2 Power 8A. The charger was brand new, the battery is pretty new as well with ~2000mi on the vehicle and garage kept, charged regularly with an older charger. I am trying to get warranty return or credit.
 
You should be able to warranty out that battery without issue if it's less than two years old. As for your battery drain issue, two months is a long time to sit. Modern vehicles will have a small parasitic drain from the ECU and other computers in the vehicle. Its usually pretty negligible but it will kill the battery if it doesn't have a tender on it or disconnect the battery altogether.
 
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