[CHeYeNNe71]

Also anyone upgrading to the H8 battery, if you don't already have it will need the smaller bracket

68039242aa rockauto under $7 shipped.

 

[Arminius]

Did you see any convenient places down there to install a battery disconnect on the negative cable whose knob would be accessible w/o any prying? Nice to hear that a memory keeper is probably not needed on a 2020 Overland.

 

[philbytx]

IIRC, there seemed to be room for a shut off. Dependent upon design of course😉

 

[Dan JGC]

FYI - For the battery hold down bracket I needed a 13 mm DEEP depth socket as the bolt is too long to reach the nut with a standard depth socket. Was all set to go but had to undo what I just did and will have to make a trip to the hardware store as I didn't have a deep depth socket... Should just be a 10-15 minute job though. I read where there are two vent holes in the battery so it said to use the positive terminal vent hole plug from the old battery and use it on the new battery's positive terminal vent hole - guess I will see when I install it.

 

[moparado]

Wonder if they are also using capacitors in the newer models?

Probably Non-volatile memory chips.

 

[moparado]

When replacing either AGM battery is there any kind of BLM monitor that needs to be reset on these WK2's?

Reason i'm asking is my F150 requires a BLM reset when replacing the AGM battery with a new one.
The reason for this is that AGM batteries require different charge rates as they age.
In other words the PCM needs to know the battery's age/history in order to provide the correct charging rate.

For example the charging rate for an old AGM battery can start the deterioration process for a new AGM battery.

Edit typo error:
Ford's battery monitor is called BMS (Battery Monitor System) and not BLM.

 

[Dan JGC]

When replacing either AGM battery is there any kind of BLM monitor that needs to be reset on these WK2's?

Reason i'm asking is my F150 requires a BLM reset when replacing the AGM battery with a new one.
The reason for this is that AGM batteries require different charge rates as they age.
In other words the PCM needs to know the battery's age/history in order to provide the correct charging rate.

For example the charging rate for an old AGM battery can start the deterioration process for a new AGM battery.

I don't recall seeing that on the instructions on the battery lid but will have to double check. Went to replace the battery and the new one from Auto Zone is too long... I ordered the correct one per the website for V8 engine etc. Argh. LOL Had to put the old one back in and now another trip to the store (after already having to get a deep socket 13 mm socket). It is one of those things that take three tries apparently... LOL Hoping not four tries! It isn't difficult but gotta make sure the unused vent at the positive terminal is plugged would be the only thing to keep in mind.

 

[jimntempe]

I don't recall seeing that on the instructions on the battery lid but will have to double check. Went to replace the battery and the new one from Auto Zone is too long... I ordered the correct one per the website for V8 engine etc. Argh. LOL Had to put the old one back in and now another trip to the store (after already having to get a deep socket 13 mm socket). It is one of those things that take three tries apparently... LOL Hoping not four tries! It isn't difficult but gotta make sure the unused vent at the positive terminal is plugged would be the only thing to keep in mind.

THere are two battery sizes in use, the one for the diesel is larger. It fits but you need to by a different hold down clamp. Very possibly they sold you the one for the diesel.

 

[Dan JGC]

THere are two battery sizes in use, the one for the diesel is larger. It fits but you need to by a different hold down clamp. Very possibly they sold you the one for the diesel.

Thanks for the info. I ordered it at Auto Zone online for same day store pick up. I put in the accurate info for V8 5.7 and all the other details so their system must be wrong - which was a pain. So decided to get a Die Hard at Advance Auto instead since their online system brought up the correct battery and it was on the way. Will install on Friday when I have time. Not hard but gotta remember to plug the positive side vent hole before installing the new one - I'm sure a lot of people forget that as both vent holes come open. Will use the plug from the old one in the new one.

 

[Dan JGC]

I didn't see anything in the manual or battery replacement instructions about "When replacing either AGM battery is there any kind of BLM monitor that needs to be reset on these WK2's?". Good question though.

Now that I had the right battery and the 13mm deep socket it took less than 30 minutes. I can't remember the last time I actually replaced a battery myself so others might do it faster. Oh and having a good flashlight helps.

It is a little trickier when under the seat. Getting the compartment cover off is a little tricky too as the two hinge like clips are tricky to unclip - the left one would unclip easily but then that made the right one almost impossible to unclip with the lid angled like that so by unclipping the right clip first made it so I could wiggle the left clip to unclip it - in the end I could have left the cover hinged in place and still would have been able to replace the battery. Once the negative terminal is off and the hold down bracket is off, it is easier to get to the positive terminal if you slide the battery toward you (now that the hold down bracket is off). I did put the new battery post caps on each terminal when removing the old battery to prevent them from touching anything metal. Same when installing the new battery. I also used baggies to cover the wire clamps as it is tricky with them flopping around. Also be sure to slide the new battery fully forward in the bracket and move the hold down bracket forward to be fully against the battery as the bolt holes allow for some movement. Lastly make sure the vent tube isn't kinked including not letting the stiff negative wire from pressing against it preventing full ventilation - double check once all is installed as well as that it is fully inserted and seated into place.

The big thing for DIYers is to install the vent port plug on the new battery. I used a needle nose pliers to remove the vent port plug from the old battery and installed it on the new battery. See two photos including the instructions on the bottom of the battery compartment lid. Hope this helps and thanks to philbytx for starting this thread and for the tips especially the socket sizes!

 

[moparado]

I didn't see anything in the manual or battery replacement instructions about "When replacing either AGM battery is there any kind of BLM monitor that needs to be reset on these WK2's?". Good question though.

Now that I had the right battery and the 13mm deep socket it took less than 30 minutes. I can't remember the last time I actually replaced a battery myself so others might do it faster.

It is a little trickier when under the seat. Once the negative terminal is off and the hold down bracket is off, it is easier to get to the positive terminal if you slide the battery forward (now that the hold down bracket is off). I did put the new battery post caps on each terminal when removing the old battery to prevent them from touching anything metal. Same when installing the new battery. I also used baggies to cover the wire clamps as it is tricky with them flopping around. Also be sure to slide the new battery fully forward in the bracket and move the hold down bracket forward to be fully against the battery as the bolt holes allow for some movement. Lastly make sure the vent tube isn't kinked including not letting the stiff negative wire from pressing against it preventing full ventilation - double check once all is installed as well as that it is fully inserted and seated into place.

The big thing for DYIers is to install the vent port plug on the new battery. See two photos including the instructions on the bottom of the battery compartment lid. Hope this helps and thanks to the original poster!


View attachment 235531 View attachment 235532

I also methodically looked at my WK2's manual and didn't find anything requiring any kind of a reset when a new AGM battery is installed.
The FCA's battery saver mode must somehow figure this all out.

Would be interesting if an FCA tech would chime in here as my F150's AGM battery does require resetting the battery's monitoring system whenever a new AGM battery is installed.
I understand but could be wrong that GM vehicles require the same.

 

[jimntempe]

I also methodically looked at my WK2's manual and didn't find anything requiring any kind of a reset when a new AGM battery is installed.
The FCA's battery saver mode must somehow figure this all out.

Would be interesting if an FCA tech would chime in here as my F150's AGM battery does require resetting the battery's monitoring system whenever a new AGM battery is installed.
I understand but could be wrong that GM vehicles require the same.

This was discussed a little several months back. IIRC Someone had a Cherokee and it did require a trip to the dealer for a reset when he replaced the battery. Such has not been the case for Grand Cherokee's so far.

 

[moparado]

Next time i visit my dealership i'm gonna ask my trusted tech there for the skinny on whether something needs to get reset when installing a new AGM battery.
Far as the Owner's manual not eluding to this battery reset thing, it could be FCA expects AGM battery replacements to be done by their dealerships and not DIY.
The Owner's manual also doesn't get into specific DIY details on how to change tranny, diffs, etc. fluids either.

Stay tuned, we'll see.

 

[Dan JGC]

Next time i visit my dealership i'm gonna ask my trusted tech there for the skinny on whether something needs to get reset when installing a new AGM battery.
Far as the Owner's manual not eluding to this battery reset thing, it could be FCA expects AGM battery replacements to be done by their dealerships and not DIY.
The Owner's manual also doesn't get into specific DIY details on how to change tranny, diffs, etc. fluids either.

Stay tuned, we'll see.

Keep us posted on this...thanks!

FCA probably is skittish about allowing DIY is because of the venting of the battery located in the cabin. Easy to have that hose kinked or forget to plug the positive side.

 

[Mongo53]

When replacing either AGM battery is there any kind of BLM monitor that needs to be reset on these WK2's?

Reason i'm asking is my F150 requires a BLM reset when replacing the AGM battery with a new one.
The reason for this is that AGM batteries require different charge rates as they age.
In other words the PCM needs to know the battery's age/history in order to provide the correct charging rate.

For example the charging rate for an old AGM battery can start the deterioration process for a new AGM battery.

Does the F150 check the charge state of the battery and adjust the charging system accordingly or does it just set a constant voltage based off the temp sensor near the battery.

The WK2 does the former and is described in the FSM, this is why you can see charging voltage going up and down as you drive for no apparent reason to the driver on the WK2. Only a few years prior to the WK2, the best charging systems simply maintained a constant voltage adjusted from input from the temp sensor near the battery.

Seems to me, a system smart charging the battery would automatically adjust for the condition of the battery and doesn't need to track its age to guess at its state merely on age. But I really don't know how the Ford F150 system works.

 

[moparado]

Does the F150 check the charge state of the battery and adjust the charging system accordingly or does it just set a constant voltage based off the temp sensor near the battery.

The WK2 does the former and is described in the FSM, this is why you can see charging voltage going up and down as you drive for no apparent reason to the driver on the WK2. Only a few years prior to the WK2, the best charging systems simply maintained a constant voltage adjusted from input from the temp sensor near the battery.

Seems to me, a system smart charging the battery would automatically adjust for the condition of the battery and doesn't need to track its age to guess at its state merely on age. But I really don't know how the Ford F150 system works.

Here's a quote from my F150's Owner's manual:

After battery replacement, or in some
cases after charging the battery with an
external charger, the battery management
system requires eight hours of vehicle sleep
time to relearn the battery state of charge.
During this time your vehicle must remain
fully locked with the ignition switched off

Or as i understand right or wrong the dealership can instantly reset the relearning process for a new battery replacement with FORscan.

I plan on visiting my Jeep dealership in a couple weeks to see about the 4 tires get one free and hopefully get this battery thing resolved regarding FCA's policy on replacing AGM batteries.

 

[Lloydy76]

URGENT battery replacement!! Right guys my battery failed over night the minus 10 temps last week finally killed it off.
problem is how do I access the battery with zero power to move the chair out of the way? Not sure the battery is removable when the seat is in its lowest position?
stuck at the moment 😔

 

[Lloydy76]

dash is fully dead even with power…..any ideas?

 

[philbytx]

For starters, you can hook up a battery charger/jump starter to the external jumper points under the bonnet.
In the USA, they are in the passenger side, so they may be on the driver's side on a RH drive car.

 

[Lloydy76]

the breakdown guy got it going, the Vehicle control module had shut down when the battery went flat. The VCM then wouldn’t let anything power up even when jumper leads we’re giving power. It’s unclear If the battery is the sole reason it went flat. Heard this strange clicking noise from the front like it was a solenoid or similar repeatedly firing. Don’t think I can upload video?