[dc30307]

... they DO have an internal heater too...

I know there was talk about a year ago that they were adding heaters, but the original ones did not have them. There are documented cases of PCS failures in Teslas after swapping in an Ohmuu battery. Hopefully the HMG ICCU is more robust than that. There are legitimate concerns about using these. They may be perfectly fine, but just because someone is cautious doesn't mean they're ignorant.

 

[EV- Technician]

"It will operate at completely different voltage than 12V AGM battery."
Now THAT much is def not true, the difference between 12.0v and 12.8. is 100% a non-issue, in fact, most 12v systems run at about 13.8v off the alternator while the car is running anyway... but the rest, especially coding for it, I will certainly look into, so thanks for the info on this!

Edit: More falsehoods -
"Using LFP or NMC chemistry are strictly prohibited from using on this vehicles or any other ICE powered system with alternator designed and controlled for 12V AGM chemistry." I and a LARGE number of people use them on Canbus systems ALL the time with only 100% positive results. That's simply false.

"Ohmmu battery doesn't not have onboard heater assistance for cold weather conditions ( this will trigger Ohmmu BMS to limp mode, if you read between the lines, your EV will be dead without 12V battery running)." - Nonsense, they DO have an internal heater and are so temp tolerant they don't need a heater compared to tertiary and the BMS simply doesn't charge them until they are above freezing and with some heat generated under the hood. It simply runs off the huge aH reserves until the battery is above freezing.

"It has no heat sinks for fighting against hot weather conditions or when vehicle is operated in stop and go traffic ( where temperatures under hood where air conditioning is running, can exceed limits of LFP chemistry, where Ohmmu BMS will just go to limp mode and cause vehicle to malfunction)." Also false, the temp limit on them is quite high and have been tested in very hot conditions with desert off-roaders at underhood temps of 170+ degrees and there is no way there will be THAT much heat under the hood of an EV. But just for additional peace of mind I do wrap them in heat tape before installing too.

Maybe a compelling argument if you blindly believe that nonsense, but that is what it is, nonsense. Anyway, I will look into coding for it at least since there is the ICCU involved here, but that is the only concern out of that spiel that may be valid. With multiple, multiple sites offering these specifically for the EV6 (and a number of them are sold out) and no real complaints out there, I know I have no serious concerns at all.

I would be delighted to exchange your opinions vs facts and how onboard ICCU is designed and how dynamic voltage set for lead-acid chemistry is not good for LFP chemistry and just looking at this two examples posted below, let's not even go to the stationary software logic for charging or other parameters that ICCU is constantly receiving from smart sensor attached on negative terminal.
It you have any knowledge of LFP chemistry cells voltage and number of cells to make 12V battery ( it is actually higher voltage than 12.8 for LFP chemistry).
So please feel free to challenge me on this subject. I do need someone like you to provide true facts that are not easy to find this days by searching internet.
I actually work for living on EV vehicles.

 

[EV- Technician]

@danbfree

In the event that you agree to my participation in a professional discussion, and it becomes apparent that my assertions are accurate while yours are not, I would respectfully request that you modify your forum name to "Mr. Nonsense #1" in the presence of all forum members. While I anticipate that there may be others who will attempt to challenge my expertise, you will have the distinction of being the first to initiate this trend.

Perhaps one day we may meet in person and have the opportunity to laugh about and learn from each other.

 

[expat]

I wouldn't put a lfp batteri in my car either. And the earth cable soldering doesn't look especially inspiring on the Ommhu battery

 

[BoogieWoogieWoogie]

@danbfree

In the event that you agree to my participation in a professional discussion, and it becomes apparent that my assertions are accurate while yours are not, I would respectfully request that you modify your forum name to "Mr. Nonsense #1" in the presence of all forum members. While I anticipate that there may be others who will attempt to challenge my expertise, you will have the distinction of being the first to initiate this trend.

Perhaps one day we may meet in person and have the opportunity to laugh about and learn from each other.

That poster clearly works for Ohmmu so he will never admit any faults with his product. I truly wish we could use a lithium based battery as our 12v battery, as it doesn't make sense that a 21st century high tech car uses 100+ year old technology.

 

[bjmsam]

That poster clearly works for Ohmmu

...or merely is someone eager to justify their expensive purchase. Perhaps as the OP @TechnicallyJeff could persuade an Ohmmu engineer authorized to represent the company to address documented concerns? There is much potential in the approach, and better options based on modern technology are desirable, so it is in everyone's best interest to get to the bottom of this!

Hopefully the HMG ICCU is more robust than that.

So far the HMG ICCU appears to be an Achilles heel. Better than hope would be a guarantee of compatibility and warranty authorized by Kia / Hyundai Motor Group. Meanwhile, it seems prudent to maintain the stock configuration pending completion of the recall and/or other mitigations that owners deem satisfactory (fewer premature auxiliary battery failures, reliable AC charging at the maximum advertised rate, etc.).

 

[dc30307]

So far the HMG ICCU appears to be an Achilles heel...

Yes, it felt funny typing that considering the ICCU reliability, but to be fair to Ohmmu, I'm not aware of any ICCU failures that have been attributed to the Ohmmu battery (unlike in Tesla).

 

[Mach-20]

Has anyone ever had an ICCU failure after installing an ohmmu battery. Over 14 months ago I installed Ohmmu and have never seen the orange light since. Maybe the crappy OEM batteries are causing the ICCU to fail? Just wondering.

 

[TechnicallyJeff]

Whoa revived thread lol.

Few things I want to highlight:

Ohmmu batteries DO have self-heating. That was added around 6 months ago.

They also have better build quality than some people have alluded to. Early on their quality wasn't the best, but they've been improving. I talked to them about this last year when a video came out showing a teardown of a battery that looked pretty bad. That battery apparently was quite an old version. They sent me pics of the newer batteries internals and it was MUCH better. I wouldn't be concerned about build quality at all.

Regarding charging, it's honestly not wildly different from a regular lead acid or AGM battery. The fact is the 12v system is vehicles (ICE or EVs) are designed to be able to handle 15ish volts safely with no impact to systems. Alternators frequently push voltage in the system to 14+. I've had many ICE vehicles, and I'm sure many here have to, where you can monitor the voltage and frequently see 14.4 or so. An Ohmmu (or other LFP manufacturer) up to 14.6 volts shouldn't cause issues. Teslas had issues several years ago as they were consistently changing their 12v charging profile and it was much more sensitive.

I do want to refer to that voltage chart as well. In addition to the other benefits (longer life, lower weight, etc) LFP batteries also have less voltage sag and can still power systems even at lower SOCs. That's definitely a benefit and likely why I rarely see my orange light on my dash as often. And we know the 12v battery would charge I think 10 times or so between vehicle starts before it stops charging (it's been a while since I looked at that so I don't remember the exact amount of times). That theoretically means a less likelihood of coming out to a dead 12v battery. If the lead acid charges any time roughly 50% of the reserve capacity is used whereas the LFP can use roughly 85% of it's capacity, that means we get more use from the battery between charges. Just my speculation at least. LFP batteries also can go to 0% and be jumped fine and not have to worry that irreparable damage was caused to the battery like lead acid batteries.

Anyway just wanted to throw that out there. I'm still very happy with my Ohmmu battery. I've had literally zero issues after over a year now of use. I may see about setting up an interview with someone at Ohmmu to discuss things further in the future.

 

[dc30307]

Regarding charging, it's honestly not wildly different from a regular lead acid or AGM battery. The fact is the 12v system is vehicles (ICE or EVs) are designed to be able to handle 15ish volts safely with no impact to systems. Alternators frequently push voltage in the system to 14+. I've had many ICE vehicles, and I'm sure many here have to, where you can monitor the voltage and frequently see 14.4 or so. An Ohmmu (or other LFP manufacturer) up to 14.6 volts shouldn't cause issues.

Yes, I don't think there are any valid concerns over the LiFePO4 voltage being too high. It can't get any higher than the car charges it up to. The biggest valid concern I've seen is that lithium batteries should not be float charged. Once they're fully charged, they should be taken off the charger. The BMS in the Ohmmu will do that, and that has reportedly been the cause of some of the problems in some Teslas. The battery gets charged, the BMS disconnects it, then the DC-DC converter is left powering the 12v rail w/o the battery acting as a buffer. But as I said, I'm not aware of any ICCU failures specifically related to an aftermarket 12v battery, so perhaps it's less sensitive to this specific scenario than the Tesla DC-DC converter. Or maybe it's a rare occurrence even in Teslas with Ohmmu bateries, but more noticeable by the simple fact that there's so many of them.

 

[danbfree]

I know there was talk about a year ago that they were adding heaters, but the original ones did not have them. There are documented cases of PCS failures in Teslas after swapping in an Ohmuu battery. Hopefully the HMG ICCU is more robust than that. There are legitimate concerns about using these. They may be perfectly fine, but just because someone is cautious doesn't mean they're ignorant.

Sorry, to clarify I was referring specifically to calling LFP batteries junk just because they came from China when they are the ones who perfected the technology as well, but I'm most concerned with the technician who also made a large number of other false info too, about voltage and charge rate, etc I mentioned previously. I know personally that I will enjoy all the benefits of no 12v charging warnings, far better efficiency, better audio and less chance of electrical glitches when you don't have the voltage sag from 150 year old lead acid tech.

Here is a good video explaining the benefits to using an LFP for your 12v battery: Tesla 12V Battery Options (youtube.com) And yes, it shouldn't matter at all if they are discussing as a Tesla 12v replacement. I just hope to provide further insight when I have direct experience using these LFP batteries when they are specifically designed to use as a drop in SLA replacement. I was just shocked to see so much disinformation out there!

 

[BoogieWoogieWoogie]

Sorry, to clarify I was referring specifically to calling LFP batteries junk just because they came from China when they are the ones who perfected the technology as well, but I'm most concerned with the technician who also made a large number of other false info too, about voltage and charge rate, etc I mentioned previously. I know personally that I will enjoy all the benefits of no 12v charging warnings, far better efficiency, better audio and less chance of electrical glitches when you don't have the voltage sag from 150 year old lead acid tech.

Here is a good video explaining the benefits to using an LFP for your 12v battery: Tesla 12V Battery Options (youtube.com) And yes, it shouldn't matter at all if they are discussing as a Tesla 12v replacement. I just hope to provide further insight when I have direct experience using these LFP batteries when they are specifically designed to use as a drop in SLA replacement. I was just shocked to see so much disinformation out there!

Please state your relationship to Ohmmu. Otherwise, it's suspect that all your posts on this board are under this thread.

 

[danbfree]

Please state your relationship to Ohmmu. Otherwise, it's suspect that all your posts on this board are under this thread.

I've never heard of them before I hit this forum, because I just got an EV6... in fact, I couldn't give 2 turds less about "Ohhmu", but apparently you're not aware there are a number of LFP battery makers? Dohon, AntiGravity, and many others, I'm simply defending LFP 12v replacement as extremely worth it.

For those curious, I just bought THIS one, luckily much less yesterday before they raised the price, I had the same brand in my last ICE car and it was fantastic!

 

[BoogieWoogieWoogie]

I've never heard of them before I hit this forum, because I just got an EV6... in fact, I couldn't give 2 turds less about "Ohhmu", but apparently you're not aware there are a number of LFP battery makers? Dohon, AntiGravity, and many others, I'm simply defending LFP 12v replacement as extremely worth it.

For those curious, I just bought THIS one, luckily much less yesterday before they raised the price, I had the same brand in my last ICE car and it was fantastic!

But why are your only posts defending LFP batteries (notwithstanding them all being in an Ohmmu thread)? This is an EV6 forum. Do you go on maritime forums and defend LFP batteries without owning anything that floats on water. Something doesn't pass the smell test here.

 

[danbfree]

But why are your only posts defending LFP batteries (notwithstanding them all being in an Ohmmu thread)? This is an EV6 forum. Do you go on maritime forums and defend LFP batteries without owning anything that floats on water. Something doesn't pass the smell test here.

I really don't know what to say to someone who has selective reading comprehension, how many times do I have to mention I just got an EV6 for osmosis to occur in your brain where you understand what that means? Also, why would defending an awesome tech to literally try to help other owners sound fishy? WTH, dude, your basic logical comprehension is what smells fishy here...

 

[BoogieWoogieWoogie]

I really don't know what to say to someone who has selective reading comprehension, how many times do I have to mention I just got an EV6 for osmosis to occur in your brain where you understand what that means? Also, why would defending an awesome tech to literally try to help other owners sound fishy? WTH, dude, your basic logical comprehension is what smells fishy here...

Nice try. Your first post sounds like an infomercial! Come on, man. But since you're here from Ohmmu, can you tell us why their HQ is in the middle of nowhere in Arizona?

 

[danbfree]

Nice try. Why is Ohmmu's HQ in thee middle of nowhere in Arizona?

LOL, I have no idea, again I have never heard of them before the other day, I guess they are pushing marketing only on the EV folks... but in the ICE community we normally went with AntiGravity, and they are really expensive but are amazing quality and have a 10-year warranty. Honestly, I recommend them if utmost quality and warranty is what is most important. Personally I order my LFP's directly from Dohon through their eBay listings as a number of us have had a great experience with them and they offer very high discharge rates for modern cars. Mine had degraded from 100% to only 99% through 18 months including two winters where it performed amazing! I don't care what brand you choose, LFP tech is the bomb, period.

So my apologies for not doing the "Hi, I'm new" post thing, but really I just wanted to be helpful for owners to appreciate how good these batteries are and with personal experience to back it.

Here are some pics of my new GT-Line, feel free to reverse image search them to see they are unique.

 

[TechnicallyJeff]

Alright alright I can see why @BoogieWoogieWoogie was skeptical since his only posts were in this thread lol. But it looks like @danbfree is legit (though interesting no license plates 🤔). Can we move on?

 

[danbfree]

@danbfree

In the event that you agree to my participation in a professional discussion, and it becomes apparent that my assertions are accurate while yours are not, I would respectfully request that you modify your forum name to "Mr. Nonsense #1" in the presence of all forum members. While I anticipate that there may be others who will attempt to challenge my expertise, you will have the distinction of being the first to initiate this trend.

Perhaps one day we may meet in person and have the opportunity to laugh about and learn from each other.

So first, sorry we disagree on a lot of what you claim, and how I expressed how I felt about many of them, but seriously, I do want to hear about proven failures from using a battery literally made to be an AGM replacement with the BMS literally working as and appearing as an AGM to any system looking for it. You are 100% wrong about the slightly higher voltage to start with, 12.8v vs. 12v is 100% a non-issue when ICE cars when running operate at 13.8-14.2v typically. So that alone made me quite suspicious of the rest of your claims. Also, with LFP designed to charge at up to 14.6 (or 14.8v even?), the charge cars send to them is even more gentle on them than on an SLA and the slightly higher nominal voltage helps prevent a number of issues. When many 12v automotive accessories are rated for 13.8v performance, like audio amplifiers, they really help prevent voltage sag and are far more efficient so the charging system is not as stressed too, I even got slightly better MPG in my ICE vehicle using one. They also DO have a discharge rate of 200A, so that shouldn't be an issue under high ABS loads either.

But, other than disagreeing on some of those general use of LFP as a 12v SLA replacement in any car, where we can agree to disagree, please understand that I really am open minded to hearing about specific issues using it on the eGMP platform, I would actually appreciate your knowledge there!

 

[danbfree]

Alright alright I can see why @BoogieWoogieWoogie was skeptical since his only posts were in this thread lol. But it looks like @danbfree is legit (though interesting no license plates 🤔). Can we move on?

I have Veteran plates that are in the trunk that I'm bringing over from my last car, but I can't display those until the registration is updated, and besides in Oregon we are mailed new plates later if we do order new plates with a car, so regardless we have to just show our temporary on the back window, which you can see through the factury tint kind of, so you know it's been actually registered.

You gained a new YT sub from me today, love your vids!