How much should the battery lose when parked?

[pulledpork247]

I have a 24 Ecoboost with a parasitic drain issue. When I park i have about 98% battery. When I get up to go work I have about 60-63%.

How many percent should it drop overnight without a parasitic drain?

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[Tbone289]

I can't tell you in terms of percentages, but I can tell you that my '24 Ecoboost only draws about 10mA after systems power down.

 

[HeyBales]

So is that SOC reading Ford's special SOC from a scanner, before you click key to On in the morning, or from another device measuring Voltage and like table lookup for corresponding SOC%?

They can be vastly different - it's why morning resting voltage is more important to note.

The external device giving you a SOC% lookup from a voltage reading, after you've just been charging it during your drive - is a bogus voltage reading for purpose of SOC lookup or battery health.
Inflated value - don't use it for anything.

Ya, it'll drop hugely in like 4 hrs too.

But if this is Ford's special SOC, which is calculated from initial resting voltage and tracked while you drive for an ongoing SOC% - that would be a normal 2-4% drop from posts several have made.

Depends on if you got a really long drive and good high charge & SOC% - but battery can't hold the charge so it drops more.

 

[pulledpork247]

So is that SOC reading Ford's special SOC from a scanner, before you click key to On in the morning, or from another device measuring Voltage and like table lookup for corresponding SOC%?

They can be vastly different - it's why morning resting voltage is more important to note.

The external device giving you a SOC% lookup from a voltage reading, after you've just been charging it during your drive - is a bogus voltage reading for purpose of SOC lookup or battery health.
Inflated value - don't use it for anything.

Ya, it'll drop hugely in like 4 hrs too.

But if this is Ford's special SOC, which is calculated from initial resting voltage and tracked while you drive for an ongoing SOC% - that would be a normal 2-4% drop from posts several have made.

Depends on if you got a really long drive and good high charge & SOC% - but battery can't hold the charge so it drops more.

Hey, I've been using an Autel battery tester. When i leave battery disconnected at night it stays at 98%. Only drops when connected to the vehicle. I'm gonna be taking it to the dealership here in the next week or so to get it looked at. Just trying to figure out as much as I can before hand!

 

[HeyBales]

Hey, I've been using an Autel battery tester. When i leave battery disconnected at night it stays at 98%. Only drops when connected to the vehicle. I'm gonna be taking it to the dealership here in the next week or so to get it looked at. Just trying to figure out as much as I can before hand!

So that's considered a table lookup.

This voltage = this SOC%.
That's all.
If you give the tester a battery Ah spec - when it tests the result is used in the SOH given.

So when you do the test or get that Voltage reading very much matters.
And you didn't answer that question.
If it's had a charge within the last 2 hrs - bogus don't even bother acting on the reading.

So if that 98% was after a battery charge while disconnected from truck, and then you just disconnected the charger say and got that reading - bogus.

If you come home from a drive and test and get that 98% reading - bogus.

If you test again in the morning and get 60-63% - valid.
Again - true Volt reading would be better info to log.
And what you need to provide the dealership - true reading, not inferred.

Because the battery does hang out at 12.5 abouts by design of the BMS charging strategy - which on some tables could be considered 60% on low end.

You could indeed have a parasitic draw - but unless you give them some valid figures from good testing - they are unlikely to spend the required hours on it trying to track it down.
They'll charge it up before they leave. Let it sit overnight. Get a reading the next morning, and load test it. And they are unlikely to spend that time if you pull in and they test it high enough.

Just trying to save you the waste of time - since you have the tool to get some valid figures.
Way to test for the desired voltage reading.
Get done with drive.
3-4 hrs later before bed - get a reading.
Get another reading in the morning.
That's useful info to provide.

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