Battery

[Boosted Pony]

The whole issue with reseting the battery module is as a battery gets older it gets weaker and the charging system works harder to provide more charge to the battery, these new systems monitor this and control the charge instead of just putting a steady charge like older vehicle did, so when you change the battery on these new vehicles what happens is the charging system can over charge the new battery damaging it because the system thinks you have a 5 year old battery in the vehicle.

When you reset the system it resets the clock for how old the battery is so it knows you have a new battery so it won't over charge it.

Over charging a battery is bad for it and can damage it.

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[Rock&Roll]

When you reset the system it resets the clock for how old the battery is so it knows you have a new battery so it won't over charge it.

Over charging a battery is bad for it and can damage it.

You're probably right but I'm 5 years now on a Battery that wasn't reset in my 10 year old car. Car fires right up.


I'm probably jinxing myself with that post :(

 

[WD Pro]

You're probably right but I'm 5 years now on a Battery that wasn't reset in my 10 year old car. Car fires right up.


I'm probably jinxing myself with that post :(

I wouldn't worry about it.

The real world effects will likely be small - evidenced by your experience (and the fact that your battery has lasted longer than most get on a Mustang anyway lol)

WD

 

[Joe Gonsalves]

This was posted in the forum once, but I think it needs to be shared again.

 

[Golgo69]

Man this is insane !

I started a battery thread earlier tonight asking recommendations. My battery is almost 3 years old (will be in October), and I keep it in a tender. For the last few months, it has been dying on me. Example: in November I was at the gas station switching tunes. It took a little longer than normal and the battery died on me. Today I took the car out for a drive (first time in like 3 weeks). When I got home I washed it and cleaned the inside. Had the doors opened for quite some time. Battery died. Like I said, I keep it on a tender. Always. I literally just read about that BMS thing and when and reset mine. Was that correct? Now if I read all of that correctly, the car thinks it has a new battery. What should I do

 

[Golgo69]

Also o see some said the duralast is a CCA 700. Is there a different gold than this one? This is 590

 

[cerbomark]

Man this is insane !

I started a battery thread earlier tonight asking recommendations. My battery is almost 3 years old (will be in October), and I keep it in a tender. For the last few months, it has been dying on me. Example: in November I was at the gas station switching tunes. It took a little longer than normal and the battery died on me. Today I took the car out for a drive (first time in like 3 weeks). When I got home I washed it and cleaned the inside. Had the doors opened for quite some time. Battery died. Like I said, I keep it on a tender. Always. I literally just read about that BMS thing and when and reset mine. Was that correct? Now if I read all of that correctly, the car thinks it has a new battery. What should I do

Replace battery with a new one and reset BMS.

 

[Cobra Jet]

So with the whole battery “BMS reset”, that one has to do this when installing a NEW battery so that the system knows it’s “new”…..

What if someone did a BMS reset with an existing battery - wouldn’t the system still think it’s “new” because a “reset” was done?

Does this system do a count down when the car isn’t being used much like the oil life reset and the spare tire kit reset… and wouldn’t it be messed up if it WAS doing that and everyone is getting new batteries because the “system” is “aging” the battery and won’t perform to spec based on IT’s count down cycle?

I mean seriously - think about it - does a system truly know if the battery removed or installed is in fact “new”? Does the system truly recognize at cold or at idle (not in use) battery health based on actual “charge” left? Is it just cycling like the oil reset feature where the car doesn’t truly KNOW the oil is aged or not, it’s just basing it on some Engineer’s integrated countdown cycle embedded into the logic…. But when you or I hit the oil reset it’s like “ok, new oil” even though an oil change may not have taken place at all?

Makes you wonder….

 

[ORRadtech]

So with the whole battery “BMS reset”, that one has to do this when installing a NEW battery so that the system knows it’s “new”…..

What if someone did a BMS reset with an existing battery - wouldn’t the system still think it’s “new” because a “reset” was done?

Does this system do a count down when the car isn’t being used much like the oil life reset and the spare tire kit reset… and wouldn’t it be messed up if it WAS doing that and everyone is getting new batteries because the “system” is “aging” the battery and won’t perform to spec based on IT’s count down cycle?

I mean seriously - think about it - does a system truly know if the battery removed or installed is in fact “new”? Does the system truly recognize at cold or at idle (not in use) battery health based on actual “charge” left? Is it just cycling like the oil reset feature where the car doesn’t truly KNOW the oil is aged or not, it’s just basing it on some Engineer’s integrated countdown cycle embedded into the logic…. But when you or I hit the oil reset it’s like “ok, new oil” even though an oil change may not have taken place at all?

Makes you wonder….

Several of your points are valid.
The BMS reset is telling the computer that the battery is new. My understanding is that the computer uses the BMS to determine charging strategy. When it believes the battery is new it reduces the charging parameters because it doesn't take as much "effort" to charge a new battery as it does an older one. Particularly an older failing one. So you would essentially be under charging an already weak battery. At least until the BMS reunderstood the battery condition. That's my incomplete understanding of the BMS.
As for the oil reset, yes, if you tell it that it has new oil it it has no way (afaik) to know that it's being lied to and will restart the strategy.
In both cases the the car can only work with what it's been told. Like the old saying, garbage in, garbage out.

 

[Tom M]

Slightly off-topic, but is there a way to tell if the battery in your car is the original one? I bought my car used, and it's now 6 model years old (2020). Car only has 13K miles on the clock, and seems to be running OK.

 

[cerbomark]

it should have a date on it somewhere. My 2020 had it s original battery last year when I replaced it.

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