Battery change ???s

[HeavyDuty]

If I replace the battery in my 2021 Ranger I will probably use an Odessey red top?
If I replace - will I need to inform the Sync system?

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[ctechbob]

Supposed to reset the BMS when you change the battery, but I'm sure it has been done without. Also should update the specs of the battery in the ECU. If you have Forscan it is easy, if you don't, then you might need to either get it or pay someone.

Also, your auto windows might need resetting (easy).

 

[NOVA_Ranger]

I swapped mine out and it was good to go, nothing else required. I went with an OEM style replacement, if that matters.

 

[Motorpsychology]

The BMS needs to be reset anytime the battery is replaced.
Over the life of the battery, its charging needs change and the charging rates and capacity degrade. The BMS changes right along with it, so when installing a new battery the BMS will charge using the algorithms from the old battery and won't charge a new battery properly.

 

[TomSim]

The BMS needs to be reset anytime the battery is replaced.
Over the life of the battery, its charging needs change and the charging rates and capacity degrade. The BMS changes right along with it, so when installing a new battery the BMS will charge using the algorithms from the old battery and won't charge a new battery properly.

Can the bms be changed without a forscan reader, tapping brakes three times and the high beams somthing like that??

 

[Motorpsychology]

Can the bms be changed without a forscan reader, tapping brakes three times and the high beams somthing like that??

Simpler than that:

 

[Frenchy]

You say Odyssey red top. Do you want a Odyssey or an optima? If you want quality go with an Odyssey.

With that said it should still be an AGM battery so you shouldn't have to do much except reset the BMS. There are instructions to do it without a scan tool in the owner's manual. If you do have access to a scan tool with the capabilities or have ForScan then you can reset it with the tool.

 

[RangerBill]

Ranger Reset Battery Monitoring System (BMS) After Replacing the Battery​

To reset the BMS on a 2019+ Ranger turn the Key On then operate the high beams 5 times, then press the Brake pedal 3 times and confirm BMS reset by flashing battery light on the dash.

 

[PltFX4]

Simpler than that:

2019 Owners manual says the same thing...

"
After battery replacement, or in some
cases after charging the battery with the
external charger, the Battery Management
System requires eight hours of vehicle
sleep time (key off with doors closed) to
relearn the new battery state of charge.
Prior to relearning the state of charge, the
Battery Management System may disable
electrical features (to protect the battery)
earlier than normal."

 

[airline tech]

2019 Owners manual says the same thing...

"
After battery replacement, or in some
cases after charging the battery with the
external charger, the Battery Management
System requires eight hours of vehicle
sleep time (key off with doors closed) to
relearn the new battery state of charge.
Prior to relearning the state of charge, the
Battery Management System may disable
electrical features (to protect the battery)
earlier than normal."

But there is one thing - to do it correctly as the let it sit overnight is only measuring CURRENT battery voltage, the truck still needs a physical interaction (BMS Reset) to reset the time since install date of the battery, the system can see a voltage difference but it cannot know it is a new battery, unless you do the physical reset.

 

[PltFX4]

But there is one thing - to do it correctly as the let it sit overnight is only measuring CURRENT battery voltage, the truck still needs a physical interaction (BMS Reset) to reset the time since install date of the battery, the system can see a voltage difference but it cannot know it is a new battery, unless you do the physical reset.

Then there is this:
EASIEST FORD BMS reset - what to do after you change the battery, passive entry not working

PS: I just read the whole (3 pages.. lol) on battery changing... there is no mention that a BMS reset is required by the user, the dealer or the battery shop if not the dealer. Only the paragraph above. If it is required, by someone, why would it not be mentioned??

 

[Frenchy]

Then there is this:
EASIEST FORD BMS reset - what to do after you change the battery, passive entry not working

PS: I just read the whole (3 pages.. lol) on battery changing... there is no mention that a BMS reset is required by the user, the dealer or the battery shop if not the dealer. Only the paragraph above. If it is required, by someone, why would it not be mentioned??

I take it you have never dealt with the s reset on modern Ford vehicles? It's a pain but if you don't reset it when replacing a battery some systems will not operate correctly.

 

[PltFX4]

I take it you have never dealt with the s reset on modern Ford vehicles? It's a pain but if you don't reset it when replacing a battery some systems will not operate correctly.

LOL... No, the last "modern" Ford product I had was a 2005 Ranger. And, so far, have not had any issues that required a module/system reset.

My issue is the manual NOT mentioning the need for the BMS requiring such a reset after battery replacement.

The percentage of owners who drive to Costo and buy a new battery and swap it in is likely above average for truck market vs car. Ford knows this so mention in the manual that it needs doing by the owner, or dealer, or professional mechanic seems eessential. Not HOW to do it, just that it needs doing.

 

[got3fords]

I guess this is a moot point for those who have disabled or disconnected the BMS.

 

[airline tech]

Various manual notes:

Battery Replacement (Desc & Ops)

If the vehicle battery is replaced, it is very important to perform the battery monitoring system reset using the diagnostic scan tool. If the battery monitoring system reset is not carried out, it holds the old battery parameters and time in service counter in memory. Additionally, it tells the system the battery is in an aged state and may limit the Electrical Energy Management system functions.

The Functions being - System Off to Save Battery, ASS, Passive Entry, Door Locks, Deep Sleep Etc.
So, all the subtle indicators that the battery has an issue that needs addressed


This is what the 6-to-8-hour rest period does, so if a BMS Reset is not performed the system recalibrates but it is still seeing the OLD battery and charges it accordingly.
So, this recalibration period is only looking at current battery condition, it cannot see a (NEW) battery has been installed unless you manually (Human Interaction) tell the BCM it is there.

Battery State of Charge

The Electrical Energy Management system monitors the battery current flow and voltage to determine the battery state of charge. During the drive cycle the Electrical Energy Management system software monitors the charge and discharge current and increases the state of charge during charging, and decreasing it during discharge. During rest periods (key off with no electrical loads) when the vehicle enters sleep mode, the battery voltage is sampled to calibrate the state of charge. The sensor automatically executes this calibration anytime the vehicle enters sleep mode and when the total vehicle current draw is below 300mA. It takes 4 to 6 hours in the sleep mode to calibrate the battery state of charge to high accuracy. If the system draw does not allow the battery state of charge calibration over the previous 7 to 10, days the state of charge quality factor changes to flag this and some Electrical Energy Management system functions, which rely on the accuracy of the battery state of charge, may be temporarily turned off until a calibration takes place.

Battery Replacement (Remove & Replace)

If installing a new battery, use the scan tool to carry out the Battery Monitoring System (BMS) reset after the battery is connected.

And since someone asked - can it be done without replacing the battery - YES
but the manual contradicts itself.

NOTICE: Unless the battery is being replaced, DO NOT reset the battery monitoring system using the diagnostic scan tool. This reset is reserved for new battery installation only. This reset will clear the learned battery data, the battery time in service, and will affect the aging algorithm parameters, which have been learned since the installation of the battery.

However, if you dive into the Troubleshoot of let's say the Deep Sleep issue, constant messages.

Look at a T/Shoot Step you can perform.

Some 2017-2022 Ford/Lincoln customers may experience a notification in the FordPass®/LincolnWay® app indicating Vehicle Has Entered Deep Sleep Mode. This occurs when the vehicle has not been started for 14 consecutive days, battery voltage is at/below 9.5 volts or the body control module (BCM) 12 volt battery state of charge (SOC) drops below 50%. A warning may also set if the telematic control unit (TCU) has received an over the air update. The TCU powers down all communication when in this mode and app features are disabled. Manually start the vehicle to wake if from mode. More information is located in the app under: Account > Help > search 'Deep Sleep' in the entry box. If the condition remains, check the BCM 12v SOC. If the SOC does not change after charging the battery or after BMS reset is performed, continue with normal battery and/or BMS sensor diagnostics.

So, my conclusion is, if you are having issues related to the BMS, it may be worth a try to do the BMS Reset procedure to see if that helps your issue, it may just bring the battery back to life or at least extend it some.
It is going to be DEPENDANT on, what the internal IR Level is of the battery in question, due to the fact that the BMS sensor is mainly looking at that primary input parameter. (Aging Battery Algorithm)

Another Note:
There is no FORD documented (in-writing) on how to do the BMS Reset procedure without the Scan Tool, that procedure comes from On-Line sources & Videos, personally myself I prefer the Scan Tool method, as you get a (written confirmation) (Successful) response after you do it, plus you can verify via PID data that the - Time in Service (date) has changed to (0-Days)

The manual headlight / brake - you watch a light; did it successfully complete the request.
?‍ - the only way to validate is to hook up a scan tool and look at the PID data.

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