Battery Monitoring System, BMS, settings in ForeScan...

[GPSMan]

What Ford is saying (indirectly) is, the truck has no need for a 100% charged 12v battery.

If it lasts 3 years or 36,000 miles they have met their obligations.

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[23grayXLT84]

What Ford is saying (indirectly) is, the truck has no need for a 100% charged 12v battery.

If it lasts 3 years or 36,000 miles they have met their obligations.

I recall you said one some 50hour trip you reached 100%. 100 as in 80% or 100 as in 100 if that makes sense.

I got done with a longer drive around 40 miles this afternoon followed by 2 short drives (1st one extremely short, 2nd one 3 miles). 75 minutes later which is what is recommended wait time to check = 12.52V. Not planning on driving it tonight or tomorrow most of the day. I will measure tomorrow morning. Curious where I will be.

I think these are sealed acid ? So according to google 80% = 12.65 whereas 12.52 would be around 72%. If ford assumes 80% as the max, then that would be 98% of max. Right ?

 

[GPSMan]

I dunno man.
What I know is I always see this.
To rule out a gauge error, ScanGauge sent me a second unit at no charge. It didn't change. So the value is real.

Minutes after an hour drive.

 

[MakinDoForNow]

What Ford is saying (indirectly) is, the truck has no need for a 100% charged 12v battery.

If it lasts 3 years or 36,000 miles they have met their obligations.

YES. Means I need to have two batteries one to use and one on maintenance with a quick reversing switch between the two (monthly or bimonthly?). (Or maybe a lithium iron, if they don't suffer from partial charge problems but have 250 or more AH capacity?). I expect that a fully charged battery installed and the "up to 8 hour new battery installed learn procedure" should let BMS recognize the proper charge level. If not it has been reported that there is 12v battery type settings accessable with forscan or dealer.

 

[Skyline]

What Ford is saying (indirectly) is, the truck has no need for a 100% charged 12v battery.

If it lasts 3 years or 36,000 miles they have met their obligations.

That's one aspect of it...

The other is small engine, like the EB 2.0, performance at lower RPM. The battery charging system may just disable charging in both low and high RPM acceleration. Doing so would improve the performance and the mileage at the same time to meet the COFE goals. The auto stop/start does the same, increasing the mileage as well to meat the goal. For the most for people with longer drive, like 20 - 40 miles one way, but fails for people who drive couple of miles per day.

The 60-75% charge is not fully charged, instead, it is perpetually undercharged and never reaches the full saturation. As such, sulfation starts to set in earlier, than with fully charged batteries where sulfation is less.

I think these are sealed acid ? So according to google 80% = 12.65 whereas 12.52 would be around 72%. If ford assumes 80% as the max, then that would be 98% of max. Right ?

Most if not all car batteries are acid, like the flooded, AGM and EFB. Albeit nowadays you could get a Lithium-Ion car battery as, if you have money to burn.

That's an interesting way looking at the battery charge level, but I like it...

 

[23grayXLT84]

I dunno man.
What I know is I always see this.
To rule out a gauge error, ScanGauge sent me a second unit at no charge. It didn't change. So the value is real.

Minutes after an hour drive.

Per service manual you should measure after 75minutes minimum depending on climate to ensure all systems are off. That's on the page about checking for parasitic drains...which I plan to do but needs to be done inside cabin with all systems asleep....

I don't use any fancy gauges. Just a digital household multimeter. I'm sure there is tolerance to it but I lock my doors when I park, open the hood and don't touch anything other than battery. True 75minutes without waking anything up...

 

[23grayXLT84]

That's one aspect of it...

The other is small engine, like the EB 2.0, performance at lower RPM. The battery charging system may just disable charging in both low and high RPM acceleration. Doing so would improve the performance and the mileage at the same time to meet the COFE goals. The auto stop/start does the same, increasing the mileage as well to meat the goal. For the most for people with longer drive, like 20 - 40 miles one way, but fails for people who drive couple of miles per day.

The 60-75% charge is not fully charged, instead, it is perpetually undercharged and never reaches the full saturation. As such, sulfation starts to set in earlier, than with fully charged batteries where sulfation is less.



Most if not all car batteries are acid, like the flooded, AGM and EFB. Albeit nowadays you could get a Lithium-Ion car battery as, if you have money to burn.

That's an interesting way looking at the battery charge level, but I like it...

It is but 12v resting voltage is around 12.6 and that's 80% but 100% for Ford (and likely many others).

If you remove battery and trickle charge, can you charge it past 80% ?

 

[GPSMan]

Per service manual you should measure after 75minutes minimum depending on climate to ensure all systems are off. That's on the page about checking for parasitic drains...which I plan to do but needs to be done inside cabin with all systems asleep....

I don't use any fancy gauges. Just a digital household multimeter. I'm sure there is tolerance to it but I lock my doors when I park, open the hood and don't touch anything other than battery. True 75minutes without waking anything up...

I'm going to do it at 75 min.
Then we can compare notes.

 

[cyberdog]

Ford is absolutely limiting the 12v to 80%, apparently on nearly all models to extend battery life. - It's a hot topic on the F150 forums also. Once 80% is reached, it may actually stop charging, until the low limit is hit, keeping between like 60-80 percent charge (capacity of battery as determined by sensor) from what I've been told.

Supposedly, disconnecting the BMS feed on the negative post (there's a connector) reverts to standard charging. Whose gonna be the guinea pig?

 

[Darnon]

Supposedly, disconnecting the BMS feed on the negative post (there's a connector) reverts to standard charging. Whose gonna be the guinea pig?

Except then you're trading for a Charging System Malfunction warning on the instrument cluster everytime you start.

 

[Packer Bill]

I just recharged my battery in my 2.0 EB Mav. It now reads 80% SOC, 12.44 volts. SOH is 100%.

 

[Skyline]

It is but 12v resting voltage is around 12.6 and that's 80% but 100% for Ford (and likely many others).

If you remove battery and trickle charge, can you charge it past 80% ?

The acid battery, flooded, AGM, etc., in itself does not have PCB to control the charge. I've just changed the flooded battery in my Avalon and charged up the new one to 100% with the charger prior to replacing the old one. I've tested it about 10 days later and the SOC was 93%.

You don't need to remove the battery to charge until it is 100% SOC, just use the poles on the battery to bypass the BMS. Just be careful, you can actually overcharge the acid battery. Use the smart charger that monitors the battery SOC and stops the charging.

 

[Skyline]

I forgot to mention.... If you bypass the BMS in charging the battery, be that on/off the truck, let the BMS learn the SOC; takes about eight hours.

Back to the original subject...

Is there a settings for the BMS, increasing the charge level to say 85%, that can be changed with ForeScan?

 

[23grayXLT84]

Here are my voltages over the past 12+ hours starting yesterday

0-Drive 40 miles followed by two short trips: 12.5. Door locked, hood open
1-75 minute minimum rest: 12.54
2-3 hours later (from 1) : 12.52
3-12 hours later (from 2): 12.48
4-short drive less than 3.5 miles round trip with shutoff halfway. Return home: 12.42. Door locked, hood open
5-75 minutes later: 12.42V. No change.

So after sitting overnight and driving a short round trip distance with turning off halfway it lost 0.06V.

...anyone notice fordpass app had an update couple days ago on android for "bug fixes" ?
Likely unrelated but what if these apps try to ping your vehicle for info way too often ?

People up in Detroit know the source - 100% .

 

[Skyline]

...anyone notice fordpass app had an update couple days ago on android for "bug fixes" ?
Likely unrelated but what if these apps try to ping your vehicle for info way too often ?

Thx for the Voltage loss data, it's probably related to active modules, like telemetry, VSS, etc., being active. The 0.06V drop does not seem excessive to me, but could be wrong.

About the app pinging your truck, it's nit picking but...

The app does not ping you truck, it pings the Ford server(s) that already has most of information that you're looking for. When you start your truck with the app, it also goes through the Ford server(s); From your app Ford Server to your truck communication is through the internet. There's a noticeable delay for actually starting the truck, when compared to the key fob.

As for people in Detroit, don't get me started....

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