vette2021HTC

Fake News!!!! Lead acid batteries last longer in colder climates.

vette2021HTC

I seriously doubt the OTA update killed your battery. I completed the update and it worked, albeit with a few quirks, and the update didn't come anywhere close to doing anything to the battery.

Here are two questions which should get to the heart of your dead battery:

1. When did you take delivery of your C8?
2. How many miles are currently on the odometer?

Purple92

So - let me see if I have this right...

An "Important Update" to Improve Radio Functionality can leave the car dead.

First off - I can not fathom how ANY software update to the radio is considered as being "Important".

In those million lines of code that GM supposedly wrote - they apparently need to add a few more to monitor battery voltage during downloading and installing updates and if it drops below a point - turn everything that they turned "on" to do the update "off".

PurpleLion

Yes, this has already been pointed out. Regardless, my experience has been the opposite, but that is because many years ago I lived in the North and, from your information, batteries have just improved over time.

This has happened to a few of us now. It is not an isolated incident.

I am not sure what you are getting at with your questions. My car is a 2020. Been on a maintenance charge when necessary, etc.

SECLT22021

Cars today have multiple computers that draw power. i dont care if its in the owner manual or not. If a car i own wont be driven, door open or acc turn on for more than normal check i havea charger connected.

as i said before BMW connects there car to power before loading software at the dealership.

JillyBean

This update STINKS
5 failed times
drove the Tesla today
never get a failed update in the T
come on GM get it together you know there are issues with this with all the failed updates from owners

yelocarbuff

Question: How many of you reading this thread did NOT receive this update?

I have never received an OTA update on our Oct. 2020 build. My history screen is blank.
Dealer confirms there are no updates outstanding.
Car must have been build with latest 2021 software releases back in Oct. 2020.

I guess they held back all the updates for the rest of you, and slowly releasing them. Just like Microsoft and Apple do. You're getting last year's updates today. LOL!

What other possible explanation could there be?

Avanti

Done by the same notorious people who write auto Owners Manuals.

Stein

My car was February 2020 build Vin 901 and it failed with update and dead battery. Still on charger 9 volts so far.

Phil1098

I guess your Oct. 2020 build had this already put in???

https://gmauthority.com/blog/2021/05...he-air-update/

Explain that.

RussM05

After a number of failed updates, it finally worked around noon today. I used a bigger 6amp 12V charger yesterday to get the battery back up to charge. I just checked it and it was at 13.5 volts before it installed the update. I got in the car a few minutes earlier and saw a horizontal bar that showed % which I assume it was the status of the install. I started it after the status bar was gone and no CEL so I think it’s all good now.

I’m still confused why it drained the battery. The note posted earlier says the OnStar may stay on if the car is turned “on” during the second update try. Seems that possibly is causing the problem.

On a side note, one guy said he started charging the battery at 6 volts and now 9 volts. I don’t understand that procedure as I always thought to charge at a reduced amperage to keep from damaging the battery. I’ll have to research that one.

RussM05

It is possible to recharge a 12 v battery at 6v but it will take roughly twice as long and won’t get it back up to 12v. I learned something today.

I would prefer to set the charger to 12v and 2 amps. I don’t believe the small trickle chargers are good when the battery is totally discharged because it will take a very long time since those deliver very small amps. They are designed to maintain a charge not recharge a dead battery.

NextOne

That's what I thought. So what's the deal about folks connecting to their home wi-fi for system updates? Never understood that. Just trying to understand.

For those with 2020's and no updates... It may well be like getting OS updates on your Android phone from Verizon. It's not all at once; they roll them out in waves. Note that my update occurred sometime Friday and I have a 12/10/20 build.

Purple92

Just a quick note on how battery chargers (in general) work.

There is no simple way to regulate the amperage draw of a battery being charged - most conventional chargers use different taps on a transformer - and those different taps alter voltage. As the voltage difference between the battery's current state and the chargers output drops (as the battery gets closer to cull charge) - the amount of current flowing slows. (To give an example - I have an older Sears 2/10/ 50 amp charger. I've seen it deliver something like 8 Amps on the 2 Amp setting when the battery it was hooked to was quite low - when the battery gets nearer a full charge - it's typically delivering around 1 -2 amps.)


When a battery is quite low - normally the limiting factor is how much current the transformer of the battery charger can deliver.

Some chargers use more sophisticated circuitry to operate more efficiently, and some use microprocessor controls to better deal with charging a battery to it's maximum capacity. However - it fundamentally comes down to how much of a delta there is between the battery cell voltages and the amount of voltage the charger is delivering.

z06inVB

No but I had the C5 battery terminal leaking. Well actually mine had the positive terminal fall off the battery. Then I dealt with the first year z06 oil burn and then the column lock failure.

Maybe the guys who designed the C5 column lock went over to design the C6 z06 heads then over to C7 GS wheel design and now are C8 software engineers 😈

BigF6B

Yes, you could be right. I've got the car on my battery tender that i usually leave on my lawn mower between cuts. So I'll just let it charge a few hours longer.At last voltage check it was up to 13.8.

RKCRLR

My October 2020 build has never had any update either.

PurpleLion

My build was July 2020 and I have had 3 or 4 updates.

Car is now on my charger and is accepting a charge.

Just for the record, if anyone needs to access their battery and has never pulled off their panels before, the left and right trim pieces pull off horizontally, not vertically. I was worried about breaking tabs. Unfortunately, most of the videos don't mention this.

mschuyler

Don't you mean, "You shouldn't have two!!

NextOne

They cost about $100 if you break them and need to replace the trim pieces. I was careful and still broke two clips on the battery cover secrion and one on the passenger side short-piece section clips. This all to check for front lift reservoir leaks a few months ago.