Battery question

[MagicRobert]

Maybe this is one of the little side benefits of having agm batteries.

Also, the charging instructions in the manual are truly weird - maybe this why.

See p. 7-42

That is exactly why the charging is "truly weird". AGM batteries have been popular in motorcycles and "occasional use" cars for years. I still have one that is alive and kicking from a formerly owned 1999 Mazda Miata Special Edition.

They hold charge for a long time, but they don't like to be overcharged or completely discharged. They do release a bit of gas; hence the little tube from the battery to the trunk floor.

I was actually impressed that Hyundai put a 60 lb AGM battery in the Genesis.

 

[kn5owa]

I was actually impressed that Hyundai put a 60 lb AGM battery in the Genesis.

I was more impressed by the fact that it looks like a bear to access and replace and costs $400.

 

[Alwaysforward]

Connected m "smart" battery charger directly to the battery and it would charge for about 90 seconds, and then stop, with the message "internal short in battery" on the display....

Can you replicate the message again and snap a picture of it? I would then demand a new battery from the dealer.

 

[DRS]

I just had the EXACT same thing happen last Friday! Car was parked overnight in my garage. Nothing left on, no open doors, etc. Got in the next morning and everything COMPLETELY dead. No lit dash, nothing, zero. Connected my "smart" battery charger directly to the battery and it would charge for about 90 seconds, and then stop, with the message "internal short in battery" on the display. So, I jump-started her with my van, and took her for a 30 mile drive. Pulled back in the garage and turned the car off. Started right back up no problem. I was scratching my head as to how it could charge back that much on such a short drive from being completely dead. That evening I put the battery on a 1amp motorcycle trickle charger and left it on for 10 hours. No problems since, but it makes me worry about if/when it happens again. It was awfully convenient to happen in my garage on a weekend the first time. And I'd hate for it to happen to my wife when she's out on her own. Not sure what to do going forward. Can't prove anything to the dealer as it's working perfectly for now.... any thoughts? Takes away that confident feeling in your vehicle!

Couple quick items. Smart charger maintainers that do not have a "AGM" ability or setting will show up like what you suggest. Will show a short.

The 2015s pull power from the battery as some systems are always on (why else would I or others be able to use the Genny Blue link app to monitor my 2015 Ultimate, remote start, flash the lights?).. I wonder if there is a bug with some "always on" system. Once the system gies power dead, that problem goes away as everyone has been "hard rebooted" due to power failure. Who knows? Appears that several have had same problems.

And the FOB system, along with other items are always "on" in gen one systems like my 2012. Which also could have some bugs in the system that keeps too much alive while turned off in the garage. Again, once battery is drained, a "hard reboot" is forced that stops the unwanted drain.

 

[Man of Mystery]

Hmmm. This discussion about batteries draining has me a bit concerned. Twice a year we go to the beach for a week and drive our Avalanche, which means leaving the Genesis garaged and undriven for that week.

Has anyone seen any reference or warning concerning how long the Genesis can sit without being driven and the battery will remain charged enough to start up again?

I know when we got the 2007 Avalanche there was a warning statement about leaving it sitting without being driven for a period (around two to four weeks IIRMC) as some of the systems could drain the battery. Fortunately, we haven't had that problem even though the Avalanche once sat for at least three weeks without being driven or started.

 

[kn5owa]

Has anyone seen any reference or warning concerning how long the Genesis can sit without being driven and the battery will remain charged enough to start up again?

The 2015 shop manual states the max. down time before you have to drive the car is one month.

The battery drain (parasitic or "vampire" drain) is specified in the shop manual as "less than" 50 milliamps.

What really bothers me are the posts about dead/defective batteries. My favorite parts guy at the local dealer said they just replaced one ($400). I hope we are not looking at a repeat of the tire problems.

 

[DRS]

Hmmm. This discussion about batteries draining has me a bit concerned. Twice a year we go to the beach for a week and drive our Avalanche, which means leaving the Genesis garaged and undriven for that week.

Has anyone seen any reference or warning concerning how long the Genesis can sit without being driven and the battery will remain charged enough to start up again?

I know when we got the 2007 Avalanche there was a warning statement about leaving it sitting without being driven for a period (around two to four weeks IIRMC) as some of the systems could drain the battery. Fortunately, we haven't had that problem even though the Avalanche once sat for at least three weeks without being driven or started.

One thing we have seen in this forum. Discover, that we are not to leave the FOB inside the car in the garage. Take it inside and out of range from the car.. Otherwise that system never sleeps and seems to draw more power. Plus the FOB battery is reported to go out quicker.

Otherwise as mod mentions, it is a mystery.

I switch back between both cars. I used them for business. And will stay in one for a 2-3 weeks at a time. The other sits. So far of late, no problems..

 

[kn5owa]

One thing we have seen in this forum. Discover, that we are not to leave the FOB inside the car in the garage. Take it inside and out of range from the car.. Otherwise that system never sleeps and seems to draw more power. Plus the FOB battery is reported to go out quicker.

Otherwise as mod mentions, it is a mystery.

I switch back between both cars. I used them for business. And will stay in one for a 2-3 weeks at a time. The other sits. So far of late, no problems..

Not quite a mystery - the "fob", or "remote key" is in reality, a small transponder.

Your car is interrogating the fob every so often. And, if you are not there to push your little "fob" buttons, or at least do something - then the car interrogates the "fob" again.

Ain't high tech fun?

P.S. I keep a spare fob in the trunk - but it's in a little metal Altoids can wrapped in aluminum foil. That way, the car won't (hopefully) talk to the fob.

 

[DRS]

Not quite a mystery - the "fob", or "remote key" is in reality, a small transponder.

Your car is interrogating the fob every so often. And, if you are not there to push your little "fob" buttons, or at least do something - then the car interrogates the "fob" again.

Ain't high tech fun?

P.S. I keep a spare fob in the trunk - but it's in a little metal Altoids can wrapped in aluminum foil. That way, the car won't (hopefully) talk to the fob.

I was referring to the mod comment, saying in general, the mystery of the multiple reported problems. Not a mystery specific to the FOB. I get what you are saying about the FOB.

have read about you or others using a spare (sealed in metal) in the trunk. Good idea if a primary FOB fails on a journey from home.

I need to check the manual and see if a warning is shown on the display when the FOB battery gets low.

 

[kn5owa]

I need to check the manual and see if a warning is shown on the display when the FOB battery gets low.

Yes - see page 3-80

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[jmilr]

I just bought a new 2015 Genesis a few months ago. My car has just a little over 2,000 on it. A week ago I went to start my car and it would not start. It was clicking like it wanted to, but no luck... Anyone had a similar situation?

My '15 Ultimate exhibited a similar problem a couple of times a month ago. I can get in the car, but when trying to start, it just clicked and flashed a message too fast to read on the screen and then just died. My son ( who works for Hyundai) jump started me and I was able to drive to work with no issue. Then a week later it happened again, both times it was in my driveway (luckily) and this time my son drove it to the dealer who checked the battery and said it was more than adequately charged!

I haven't had a problem since - maybe the dealer tighten down something, I don't know, but it's shaken my confidence in an otherwise great car!

 

[kn5owa]

I haven't had a problem since - maybe the dealer tighten down something, I don't know, but it's shaken my confidence in an otherwise great car!

In my (much younger) days, the old joke was that if you bought a British sports car, be sure to have an American car to drive while the British car was in the garage.

I hope this is not the future of the Genesis - When I first saw that big hunk of battery in the trunk, I thought that would be the last thing to worry about.

 

[MagicRobert]

In my (much younger) days, the old joke was that if you bought a British sports car, be sure to have an American car to drive while the British car was in the garage.

I hope this is not the future of the Genesis - When I first saw that big hunk of battery in the trunk, I thought that would be the last thing to worry about.

AGM batteries have a boat load of plates internally with tight spacing. This battery is the biggest electrical load handling beast I have seen. They are a bear to manufacture right at this large size.

I am betting a high early mortality rate, and the others last a really long time.

Just a guess, but an educated one.

I lobby for detailed electrical stats as one more option on the tools visible to an end user (only on demand).

 

[Schindawg]

Couple quick items. Smart charger maintainers that do not have a "AGM" ability or setting will show up like what you suggest. Will show a short.

DRS - you are exactly right on the charger issue. While I do have a smart charger, when I connected it, it was trying to charge at a 40-amp level. Once it quit with the internal short error, I re-read the manual and on page 7-42, it says you should recharge at 20-30A for two hours. I think at 40A it probably couldn't handle the load. Fortunately I had that 1amp trickle charger, which is the preferred method (also on page 7-42). Always something to learn here, which is great. But also means my smart charger can't be used on the Genesis, which is a bit of a bummer. And, it still doesn't explain why the battery was completely dead in 10 hours of sitting overnight. The small amount of drain from the internal systems, FOB interatction, etc., don't explain it. FOBs were kept inside the house so constant pinging of them should not have been an issue. Still a mystery....

 

[DRS]

Yes - see page 3-80

Thank you.

 

[DRS]

DRS - you are exactly right on the charger issue. While I do have a smart charger, when I connected it, it was trying to charge at a 40-amp level. Once it quit with the internal short error, I re-read the manual and on page 7-42, it says you should recharge at 20-30A for two hours. I think at 40A it probably couldn't handle the load. Fortunately I had that 1amp trickle charger, which is the preferred method (also on page 7-42). Always something to learn here, which is great. But also means my smart charger can't be used on the Genesis, which is a bit of a bummer. And, it still doesn't explain why the battery was completely dead in 10 hours of sitting overnight. The small amount of drain from the internal systems, FOB interatction, etc., don't explain it. FOBs were kept inside the house so constant pinging of them should not have been an issue. Still a mystery....

Yes... This issue appears not to be a isolated event. Do you have your Wi-FI turned in? My Ultiamte 5.0 has a Wi-FI interface that can be connected to house W-FI for connection to Hyundai and also remote start. The manual states vague advantage using this instead of the 4G cell that is in the car. Anyway, I found the WiFi interface turned on.. I turned it off. The 4G will still be on. If you are not using it, it might be able to turn that off too. Something may be keeping systems alive that draws enough current to drain the battery? Or the battery is just plain defective. My 2012 AGM was defective and they replaced it for free, and paid for the tow.

If the battery is not defective, I wonder if they have a tool to measure (and log) over a couple of days a moment by moment electrical draw on the battery. Possible to track a bug in software that brings something alive, and does not turn it off properly. Who knows. Something possible tricky to figure out if it is not the battery.

Schumaker make a 15 amp smart charger that also has special setting for AGM. It also has a maintainer function. It is lightweight and reasonable. I got mine at Wal Mart automotive department. FYI.

 

[kn5owa]

Schumaker make a 15 amp smart charger that also has special setting for AGM. It also has a maintainer function. It is lightweight and reasonable. I got mine at Wal Mart automotive department. FYI.

I got the same charger from WallyWorld under the Black&Decker trademark and have been charging agm batteries for years with no probs.

And I just moved my jumper cables from my Sonata to the Genny - I am inclined to think there is a battery problem. The local dealer just changed a new one out, and I think it's safe to assume the orig. was checked out pretty well (they cost $400).

 

[DRS]

I got the same charger from WallyWorld under the Black&Decker trademark and have been charging agm batteries for years with no probs.

And I just moved my jumper cables from my Sonata to the Genny - I am inclined to think there is a battery problem. The local dealer just changed a new one out, and I think it's safe to assume the orig. was checked out pretty well (they cost $400).

Makes sense... Keep jumper cables in the trunk.

And yet I do wonder if the AGM batteries are getting damaged by the drain from they systems even when turned off over time. Like sitting in dealer lots. And/or being moved around the lots with multiple start up (as they move it around), and quick shut down without recovering the battery from the start. On my 2012, knock on wood, I have not had problems since the battery was changed within 6 months of purchase.. The 2015 I have not seen a problem, yet.

 

[kn5owa]

Makes sense... Keep jumper cables in the trunk.

And yet I do wonder if the AGM batteries are getting damaged by the drain from they systems even when turned off over time. Like sitting in dealer lots. And/or being moved around the lots with multiple start up (as they move it around), and quick shut down without recovering the battery from the start. On my 2012, knock on wood, I have not had problems since the battery was changed within 6 months of purchase.. The 2015 I have not seen a problem, yet.

The only way I can see damage from the parasitic drain - which is specified at <50 milliamps - is if the battery became completely discharged, particularly if the batt. was left that way for awhile.

People have lots of diverse ideas on batteries - esp. agm batt's - but I think everbody agrees that a total discharge is not a good thing.

One current theory is that large agm batt's have many, many plates and are subject to internal shorts.

 

[DRS]

The only way I can see damage from the parasitic drain - which is specified at <50 milliamps - is if the battery became completely discharged, particularly if the batt. was left that way for awhile.

People have lots of diverse ideas on batteries - esp. agm batt's - but I think everbody agrees that a total discharge is not a good thing.

One current theory is that large agm batt's have many, many plates and are subject to internal shorts.

Yea, as good a theory as any.