[tjbute]

What are the symptoms of the 12V battery dying on a PHEV?

 

[MalekFahl]

Anyone else have problems with keeping a good charge on this replacement battery? I bought it a year ago, and today I noticed it's only at 11.6 volts. Also had check charging system screen pop up today, and car wouldn't start.

 

[Frank Xu]

Anyone else have problems with keeping a good charge on this replacement battery? I bought it a year ago, and today I noticed it's only at 11.6 volts. Also had check charging system screen pop up today, and car wouldn't start.

On my car the voltage shrink to 12.3-12.4 after 3-4 days (from fully charge). A week without driving it will be around 12.25-12.35. I suspect anti-theft system takes more energy than regular car. Or maybe my car has phantom drain issue/I forget to turn off something.

 

[MalekFahl]

On my car the voltage shrink to 12.3-12.4 after 3-4 days (from fully charge). A week without driving it will be around 12.25-12.35. I suspect anti-theft system takes more energy than regular car. Or maybe my car has phantom drain issue/I forget to turn off something.

Thanks for sharing that, I must have a bad battery, I drove it for 4 hours the other day and the highest my charge got was 11.8 volts, I bought it last year. Good thing it has a 3 year warranty.

 

[Frank Xu]

Thanks for sharing that, I must have a bad battery, I drove it for 4 hours the other day and the highest my charge got was 11.8 volts, I bought it last year. Good thing it has a 3 year warranty.

Yeah that's definitely a bad battery. It should top off at 12.6-12.7v after one hour highway drive.

 

[USER2065]

Have had my 2011 Hyundai Sonata Hybrid for 5 years now. In Dec 2020 noticed that the charge on my battery was low. For example I would notice the cabin lights looked dim and a couple times the car would not start for a few tries. All symptoms of your standard car battery going bad in cold weather (well cold for Texas). Once the car started and the hybrid system took over the car would run fine.

I used earlier posts on this forum to find a replacement battery specs. Unfortunately neither Advance Auto parts or Autozone had the right batteries available. I managed to find this.

https://www.oreillyauto.com/detail/...ttery-h6r/48rprmj/5632552/2011/hyundai/sonata

Has worked great with no problems for a month. Hope this helps.

 

[RAYMUND155]

My 2012 Sonata Hybrid is going on 6 years old (purchased Jan 2012) Can you believe im still using the original 12v battery!
The heat down here in South FLorida is hard on batteries and I always get a new one after 4 years. Now that my OEM battery is nearing 6 years old I knew I had to replace it or risk getting stuck. ( the car still starts instantly, im curious how long the original battery would last if I kept it)

Side note: I discovered the reason the 12v battery lasted as long as it does. It doesnt actually start the car. The 12v only turns on the cars computer and runs the accessories when in ACC MODE.
The 270v hybrid battery actually starts the car.
Anyways, after a lot of searching on the intern-webzzz and this forum, the best I could find are "similar" batteries or a battery that needed a modified battery box to hold it stable.
I did a lot of searching at auto parts stores and again, few would show as "THIS FITS YOUR CAR" and the couple that did were $200+
No way im going to pay Hyundai $329 for a battery! YES! They want $329 for an OEM 12v battery! INSANITY!
I kept searching then discovered ADVANCE AUTO PARTS has one that says it will fit , is vented and its only $155.
Took a chance and ordered it and it not only fits , its the identical battery to my OEM battery in every way and even made in South Korea. ( the same 600CCA too)
Battery was only $155, and FREE SHIPPING! I found a code RETMENOT20 which saved me another $31 ! The core charge was $22 which I think you can get some core money back by returning to an auto parts store (im keeping mine to run a livewell pump) So even with tax and core charge I only paid $157 right to my door! O yeah, I recieved the battery 2 days after I ordered it! THANK YOU ADVANCE AUTO!

Here is the link. Im attaching a photo showing the battery installed. It even has the hole to attach the VENT HOSE!

Listed on website as AUTOCRAFT GOLD BATTERY-GOLD ATOCF

[Advance Auto Parts - Down for Maintenance

I just changed my 2013 Hyundai Sonata Hybrid battery 124R, 78 amps, 3 yr warranty at the Hyundai Dealer for $180. ($210 - $30 coupon). Walmart had ran out of 124R MAXX battery, 110 amp, w/5 yrs warranty for $88. The only difference is the Hybrid 12v battery has a vent to prevent acid corrosion in the trunk.

When the 12V acc battery died, the car threw a tantrum, lighting up the 2013 Sonata Hybrid dash like a Christmas Tree, refused to turn off the alarm, refused to allow me to get into the car, found manual key and refused to allow engine start. It was very difficult to locate the manual key slot in the dark to open the trunk. it took 24-48 hrs of charging to start the car and get it to the dealer for a new battery.

My 2 other regular 2010 Hyundai Tucson Limited AWD and Santa Fe GLS AWD can use the Walmart 124R with 110 amps made by Johnson Control In USA.

60-70% of all Batteries are made by Johnson Control. Including Hyundai, Toyota, Chevy, Ford, AutoZone, Walmart, etc. It’s just the sticker. ...and vent for Hybrid to prevent corrosion. Walmart does sell a plastic case with vent to prevent corrosion, $15.95.