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new 12 volt battey dying.

2417 Views 12 Replies 6 Participants Last post by  yfrqnk14
new 12 volt battery.
when the old battery died, i assumed it was old age and replaced it.
i am out of work with an injury, only using car once or twice a week, since i put in the new battery.
after sitting for 4 days, battery was dead. doors would not unlock. display would not light up when i opened the door.
assumed new battery was not fully charged, charged it for an hour. shop charger/starter, not a trickle charger.
next day, dead. jumped with portable jumper. drove for two hours, stopped twice. car started.
i am assuming it is not the battery because it holds the charge for a few hours.
i searched on here and saw similar problems with suggestions of a bad battery or onstar drain.
my onstar is not active.
i am thinking of charging and then disconnecting the battery and let it sit for 2 days.
if it starts, i believe that will eliminate the possibility that it is the battery.
if it starts, i will then try pulling the onstar fuse, F9, is it?

anyone have any thoughts or suggestions?
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Have you confirmed that when plugged in and actively charging your Gen1 when turned off the Lear 3.3kW on-board High Voltage Charger is keeping the 12V AGM topped off as designed? This can be verified by measuring the DC voltage between the two battery terminals which should raise the DC voltage to above @13VDC when the Volt is plugged in and charging as it does on my Gen1...
i cant charge the main batteries.
car wont let me charge it.
service high voltage battery message is on.
You may want to resolve this issue first prior to figuring out why your Gen1 is now eating 12V AGM batteries I suppose.

If you can get a GM service dept. to successfully clear the latched DTC code(s), you should consider buying WOT's bypass plug in order to prevent latching this code in the future that prevents your Gen1 from charging...
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