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Discussion Starter · #1 ·
Has anybody else had issues with the battery the 2021 comes with?

I've been getting warnings from my HUM since January 2022 that my voltage has suddenly dropped (then it goes back to normal 2-6hrs later) but the dealership would always say everything tested good. Now my aftermarket astrostart the dealership installed doesn't work (just in time for -30 wind chills again, yay), the dealership took over 3 weeks to get me back in after the installer said the battery is the problem, and now I'm over my mileage for it to be covered under warranty (I'm talking to a supervisor Monday cuz now I have to jump my car to start it every single time).

So far I know of one other person with a 2021 experiencing this issue. To top it off I got rear ended at a red light so I'm just sad. I really like this car. Unfortunately nobody in town sells batteries to fit this car. Can't even order one from keystone. I have no idea if what the dealership has will be the same brand as what I currently have.
 

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I haven't heard of any batteries failing...until now. The OEM battery from Hyundai is a Rocket brand part number CMF45L-DIN Odd the aftermarket hasn't jumped on listing a replacement battery for Venue. The 2011-2015 Hyundai Accent used the same factory battery. The 2012-2017 Veloster did too. Replacement batteries for those, listed on Rockauto, are Group 47 but they are longer than the original so I can't vouch for fitment but the measurements of a H4 and 140R group batteries should be a near perfect fit but confirm the dimensions before purchasing.
The original battery dimensions, per the service manual, are:
Length (mm) 205 - 207
Width (mm) 173 - 175
Height (mm) 164 - 168
Total Height (mm) 188 - 190
 

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Discussion Starter · #3 ·
Thank you so much!

I haven't heard of any batteries failing...until now. The OEM battery from Hyundai is a Rocket brand part number CMF45L-DIN Odd the aftermarket hasn't jumped on listing a replacement battery for Venue. The 2011-2015 Hyundai Accent used the same factory battery. The 2012-2017 Veloster did too. Replacement batteries for those, listed on Rockauto, are Group 47 but they are longer than the original so I can't vouch for fitment but the measurements of a H4 and 140R group batteries should be a near perfect fit but confirm the dimensions before purchasing.
The original battery dimensions, per the service manual, are:
Length (mm) 205 - 207
Width (mm) 173 - 175
Height (mm) 164 - 168
Total Height (mm) 188 - 190
 

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the only time I ever had a battery problem where it wasn't the battery's fault was when I got my new 1999 Camaro SS convertible and after a few months the battery wasn't good enough to start the car, or all my gauges would go to the extreme right when starting the car especially when it hadn't been used for say 4 or 5 days...I first put my battery charger on it for a few hours and then all was fine and then I'd get the starting problem...I took the car back to the dealership to have them give the battery the stress test and all was fine and then after a short time again the same problem.

now one thing I was doing was while in my garage I'd put the top down and the windows done and listen to the car stereo while I was polishing the car, and all this was on the battery, and after a bit I believed I was causing too much drain on the battery so I'd put the battery charger on when I was using too much battery only...after the problem kept happening and especially after driving a 250 mile trip, and got home and shut the car off, and went back out to start the car about an hour after getting home the battery again didn't have enough power to start the car.

I went back to the dealership and explained everything to them that I was doing and figured that after driving the 250 mile trip I should of had enough power an hour later to start the car, and as well I had joined a board like this one for Camaros and a few people were having the problem with the gauges going to the extreme right when starting [I know many cars now do this but back then they didn't] so I mentioned this to the service guy...he called someone at GM and they explained that because of the cars now have computers and thief control things that there's always battery being used while the car is not in use and that for me to even drive the 250 miles the alternator system would not be able to charge up the battery like they use to in previous years...he said to high charge the battery till the temperature got warm and that way it would get to where it should be and I wasn't helping things by doing what I was doing when I was polishing my car and using the battery the way I was and that when I put my charger on I wasn't putting it on longer enough so we had to put a higher charge on it to get it back to where it should be...that original battery lasted more then 12 years...and because my Camaro is stored every winter I put the charge on once a week, and I bought a better charger that has an auto setting.

as well since 1999 I put the charger on my daily drivers at least once a month even though I used the daily drivers almost every day and I got very long battery life and no starting problems.

I got my Venue in June and it's my daily driver, and it has a lot more things using power when the car isn't in use than my older vehicles...I still put the charger on the auto setting once a month and will do the same sooner if the weather gets very cold and I'll also use the block heater.

I'm not saying this is your problem but I thought I'd let you know my experiences with batteries in vehicles especially in the cold...when I start my Venue I turn on the seat warmer and the steering wheel warmer along with all the other stuff and sometimes I might only drive a few miles and the car may sit for a few days and I'm sure I stressed the battery,and even though it's new I'll still put the charger on once in a while and in the auto setting I've seen it take maybe 6 or more hours to get to the full mod on the charger.
 

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Discussion Starter · #5 ·
the only time I ever had a battery problem where it wasn't the battery's fault was when I got my new 1999 Camaro SS convertible and after a few months the battery wasn't good enough to start the car, or all my gauges would go to the extreme right when starting the car especially when it hadn't been used for say 4 or 5 days...I first put my battery charger on it for a few hours and then all was fine and then I'd get the starting problem...I took the car back to the dealership to have them give the battery the stress test and all was fine and then after a short time again the same problem.

now one thing I was doing was while in my garage I'd put the top down and the windows done and listen to the car stereo while I was polishing the car, and all this was on the battery, and after a bit I believed I was causing too much drain on the battery so I'd put the battery charger on when I was using too much battery only...after the problem kept happening and especially after driving a 250 mile trip, and got home and shut the car off, and went back out to start the car about an hour after getting home the battery again didn't have enough power to start the car.

I went back to the dealership and explained everything to them that I was doing and figured that after driving the 250 mile trip I should of had enough power an hour later to start the car, and as well I had joined a board like this one for Camaros and a few people were having the problem with the gauges going to the extreme right when starting [I know many cars now do this but back then they didn't] so I mentioned this to the service guy...he called someone at GM and they explained that because of the cars now have computers and thief control things that there's always battery being used while the car is not in use and that for me to even drive the 250 miles the alternator system would not be able to charge up the battery like they use to in previous years...he said to high charge the battery till the temperature got warm and that way it would get to where it should be and I wasn't helping things by doing what I was doing when I was polishing my car and using the battery the way I was and that when I put my charger on I wasn't putting it on longer enough so we had to put a higher charge on it to get it back to where it should be...that original battery lasted more then 12 years...and because my Camaro is stored every winter I put the charge on once a week, and I bought a better charger that has an auto setting.

as well since 1999 I put the charger on my daily drivers at least once a month even though I used the daily drivers almost every day and I got very long battery life and no starting problems.

I got my Venue in June and it's my daily driver, and it has a lot more things using power when the car isn't in use than my older vehicles...I still put the charger on the auto setting once a month and will do the same sooner if the weather gets very cold and I'll also use the block heater.

I'm not saying this is your problem but I thought I'd let you know my experiences with batteries in vehicles especially in the cold...when I start my Venue I turn on the seat warmer and the steering wheel warmer along with all the other stuff and sometimes I might only drive a few miles and the car may sit for a few days and I'm sure I stressed the battery,and even though it's new I'll still put the charger on once in a while and in the auto setting I've seen it take maybe 6 or more hours to get to the full mod on the charger.

Hmm that's very interesting. I would've thought that, but it has been hit or miss with starting. It has actually been sitting at the dealership for weeks now because it was so dead one day it couldn't be jumped. But then other days after sitting in -30 for 12+ hours it started fine all day. I finally got the dealership to take me seriously and they unplugged everything aftermarket cuz they had tried to insist it was because I have aftermarket autostart (I have an SE, as it was the only Venue the dealership had in 2021 when I bought my car - so the dealership contracted out to install it before i bought it). Well, even with everything unplugged it was still randomly not starting for them. I've been driving a 2023 sonata but I miss my Venue :(.

They texted me that they "noticed my windshield wipers were intermittently not working properly" (I'd personally never noticed a problem with anything other than the starting/autostart issues mentioned) so they ordered a new ICU junction box and said they'd reassess my Venue after they install it. No idea if a bad ICU junction box could make a car randomly not start/battery die. Cuz I live out of town and my commute to work is about an hour each way. Even after driving for an hour sometimes my car wouldn't start even 5min after being turned off so a parasitic drain would make no sense (I had a loooong argument with the dealership technicians regarding this and ended up going in person to talk to the service manager who agreed with me on this).

I'm at a loss. I'm still waiting to send it for repair from being rear ended so it just feels like I'm never getting it back. And I have very little faith in the dealership technicians after all the arguments regarding my HUM/autostart. I'm a bit worried they'll just claim it fixed when it isn't.
 

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Hmm that's very interesting. I would've thought that, but it has been hit or miss with starting. It has actually been sitting at the dealership for weeks now because it was so dead one day it couldn't be jumped. But then other days after sitting in -30 for 12+ hours it started fine all day. I finally got the dealership to take me seriously and they unplugged everything aftermarket cuz they had tried to insist it was because I have aftermarket autostart (I have an SE, as it was the only Venue the dealership had in 2021 when I bought my car - so the dealership contracted out to install it before i bought it). Well, even with everything unplugged it was still randomly not starting for them. I've been driving a 2023 sonata but I miss my Venue :(.

They texted me that they "noticed my windshield wipers were intermittently not working properly" (I'd personally never noticed a problem with anything other than the starting/autostart issues mentioned) so they ordered a new ICU junction box and said they'd reassess my Venue after they install it. No idea if a bad ICU junction box could make a car randomly not start/battery die. Cuz I live out of town and my commute to work is about an hour each way. Even after driving for an hour sometimes my car wouldn't start even 5min after being turned off so a parasitic drain would make no sense (I had a loooong argument with the dealership technicians regarding this and ended up going in person to talk to the service manager who agreed with me on this).

I'm at a loss. I'm still waiting to send it for repair from being rear ended so it just feels like I'm never getting it back. And I have very little faith in the dealership technicians after all the arguments regarding my HUM/autostart. I'm a bit worried they'll just claim it fixed when it isn't.
best of luck they find the problem...I had a 1970 Charger R/T that was blowing a fuse every now an then and the car was only a few weeks old...I left it with the dealer and they found the fuse only blow if the driver's door was open and then when they put in the ignition key to start the car the fuse blow...there was a pinched wire in the steering wheel area that cause the fuse to blow and only if the driver's door was open when trying to start the car and it wouldn't blow if the door was closed and the ignition key was put in to start the car...vehicle wiring is the worst stuff to work on especially with all the stuff we have now.

not saying that's the problem but it doesn't take much to cause a problem on vehicles...another thing on the Venues is that they have a switch under the dash that can be used to shut off the battery power and I'm not sure as to what it all shuts down but something like a bad switch on something like this could be a fault as well as of so many other things. 馃し鈥嶁檪锔
 

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@venue1947 Here is the function of the Fuse switch in the passenger compartment fuse panel.
@Tyrannosaurus The ICU, IBU and PCM are all involved when starting the car. The absence of trouble codes makes it all the harder to diagnose the issue, especially since it's intermittent. Common to the starting and wiper systems are the battery, ICU and the IBU. A bad ground connection somewhere in the car can make things do weird stuff. Very frustrating problem, I hope the figure it out soon.
 

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Discussion Starter · #8 ·
@venue1947 Here is the function of the Fuse switch in the passenger compartment fuse panel.
@Tyrannosaurus The ICU, IBU and PCM are all involved when starting the car. The absence of trouble codes makes it all the harder to diagnose the issue, especially since it's intermittent. Common to the starting and wiper systems are the battery, ICU and the IBU. A bad ground connection somewhere in the car can make things do weird stuff. Very frustrating problem, I hope the figure it out soon.
Well, today they're back to blaming my astrostart and "had to unplug it" even though it had been unplugged for weeks and still wouldn't start so now I'm just waiting on the manager to call me. I don't feel like they actually have any clue what is wrong 馃槵
 

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Cars have become too complex. Now if the car doesn't throw a code to tell them what's wrong or the problem is not listed in the service manual. They are completely lost. I hope they get it figured out soon.
 
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