How healthy is your 12v AGM battery ? [update to recommend replacing at 36mo]

[dtbaker61]

To clarify, I meant that instead of staying at 85-90% (on ford.com) after an assist from the external power supply, I would observe it settle back down to 40-65%, which may have been an indication of less than stellar battery health.

did 12v SOC drop, or increase when vehicle was ON ?

if you were checking 12v SOC via FordPass, that would have 'woken up' your vehicle, and predictably drained about 10% from the 12v while going back to sleep.

You best chance at retaining 12v charge is to turn OFF Bluetooth, and 'force-stop' FordPass to let your Pony sleep soundly.

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[Jerrytball]

I can tell you right now for a fact that plugging in the car and charging at home does charge the 12 V battery. This morning I took my 12 V battery because last night it was 83%, I woke up this morning. It was 75%. I charged my car for two hours and now it’s at 94%.

 

[macchiaz-o]

did 12v SOC drop, or increase when vehicle was ON ?

if you were checking 12v SOC via FordPass, that would have 'woken up' your vehicle, and predictably drained about 10% from the 12v while going back to sleep.

You best chance at retaining 12v charge is to turn OFF Bluetooth, and 'force-stop' FordPass to let your Pony sleep soundly.

I wasn't checking via FordPass. I understand this impact, so in fact I wasn't opening FordPass at all while trying to determine if my vehicle battery was failing.

I can tell you right now for a fact that plugging in the car and charging at home does charge the 12 V battery. This morning I took my 12 V battery because last night it was 83%, I woke up this morning. It was 75%. I charged my car for two hours and now it’s at 94%.

Yes, you're correct, but I don't think anyone ever said otherwise??

 

[Jerrytball]

I wasn't checking via FordPass. I understand this impact, so in fact I wasn't opening FordPass at all while trying to determine if my vehicle battery was failing.



Yes, you're correct, but I don't think anyone ever said otherwise??

There’s been talk going back-and-forth about it and I just decided since I was looking at it last night and this morning I just wanted to validate it but there’s some we’re saying it didn’t some said they thought the car had to be running but I think mostly everybody knew charging the big battery. Does the small battery,

 

[phil]

You best chance at retaining 12v charge is to turn OFF Bluetooth, and 'force-stop' FordPass to let your Pony sleep soundly.

No doubt you are right, but this sounds suspiciously like work.

 

[Jerrytball]

did 12v SOC drop, or increase when vehicle was ON ?

if you were checking 12v SOC via FordPass, that would have 'woken up' your vehicle, and predictably drained about 10% from the 12v while going back to sleep.

You best chance at retaining 12v charge is to turn OFF Bluetooth, and 'force-stop' FordPass to let your Pony sleep soundly.

Yeah, I’m gonna start doing that when I’m sitting in the house especially now that the phone is set up as a key. Like I said before I said about 25 feet from the car and the lights just keeps going on and off all night soon as I move my phone. That’s probably why my battery was at 75%

 

[dtbaker61]

I wasn't checking via FordPass. I understand this impact, so in fact I wasn't opening FordPass at all while trying to determine if my vehicle battery was failing.

so, how were you checking the 12v SOC ?

 

[dtbaker61]

Yeah, I’m gonna start doing that when I’m sitting in the house especially now that the phone is set up as a key. Like I said before I said about 25 feet from the car and the lights just keeps going on and off all night soon as I move my phone. That’s probably why my battery was at 75%

Yes, if you use PAAK, and park your car within 100' of where you walk around all day, the easiest and quickest way to let your MME sleep is to turn BT off on your phone. The when you head out, turn it back on as you head for the garage....

 

[macchiaz-o]

so, how were you checking the 12v SOC ?

https://www.ford.com/myaccount/account-dashboard

 

[dtbaker61]

There’s been talk going back-and-forth about it and I just decided since I was looking at it last night and this morning I just wanted to validate it but there’s some we’re saying it didn’t some said they thought the car had to be running but I think mostly everybody knew charging the big battery. Does the small battery,

yes, 12v charges while HV is charging....

However, to get the 12v fully charged up to 100% to desulfate and recover/retain capacity can take 24-48 hours.

so.... unless you are charging your HV on L1 from empty to full, the typical charge session does not last long enough to desulfate the 12v and get it up to 100%. This is why it is a great idea to 'periodically' use a 12v charger, power supply, or simply leave the MME 'on' overnight to get the 12v to 100%.

 

[dtbaker61]

https://www.ford.com/myaccount/account-dashboard

that would query by wi-fi when you ask for an update, and wake up your MME, and drain about 10% in the 2 hours it takes to go back to sleep.

 

[Jerrytball]

yes, 12v charges while HV is charging....

However, to get the 12v fully charged up to 100% to desulfate and recover/retain capacity can take 24-48 hours.

so.... unless you are charging your HV on L1 from empty to full, the typical charge session does not last long enough to desulfate the 12v and get it up to 100%. This is why it is a great idea to 'periodically' use a 12v charger, power supply, or simply leave the MME 'on' overnight to get the 12v to 100%.

Trying to find the thread of the best for lack of a better Word, trickle charger. I know it’s not a trickle charger, but it’s a specific one that works best with this type of battery.

 

[dtbaker61]

No doubt you are right, but this sounds suspiciously like work.

turning BT off/on your phone is too much for you ?

 

[Jerrytball]

turning BT off/on your phone is too much for you ?

Like when John Candy was the security guard at Wally world they made him ride on the roller coaster”woo I’m exhausted”?

 

[phil]

turning BT off/on your phone is too much for you ?

And closing and reopening an app? On both of my phones? Every day, perhaps more than once?

Yes, that is too much.

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