Does 90-100% hold more kWh?

[raijinmach]

I noticed the charging rate at 30-80% is the same as 90-100% at L2 chargers but the latter takes three times as long to charge. Is there more mileage in the last 10%?

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[ChrisO]

No it doesn’t hold more. This has to do with what is good for the battery and some basic physics.

You can think of it like when you are pouring something into a glass when you start out you might pour fast because there is lots of space but as you get closer and closer to filling it to the top you have to slow way down so that you don’t over fill it.

This time difference in charging is the main reason why people suggest not charging over 80% at a fast charger, especially if someone is waiting.

 

[raijinmach]

No it doesn’t hold more. This has to do with what is good for the battery and some basic physics.

You can think of it like when you are pouring something into a glass when you start out you might pour fast because there is lots of space but as you get closer and closer to filling it to the top you have to slow way down so that you don’t over fill it.

This time difference in charging is the main reason why people suggest not charging over 80% at a fast charger, especially if someone is waiting.

But the charge rate is still the same regardless. Wouldn't the charge rate slow down if it was taking longer? It's 5 kw no matter if its 50% or 90% on a L2 charger.

 

[ChrisO]

But the charge rate is still the same regardless. Wouldn't the charge rate slow down if it was taking longer? It's 5 kw no matter if its 50% or 90% on a L2 charger.

The charge rate should go down.

I will state one thing I was thinking of fast charging. If you are only charging at 5 kW that should already be “very slow” and really shouldn’t slow down.

 

[ChrisO]

One thing I can tell you with certainty is the to 10% will not give you more mileage than any of the “other 10%s”.

So that only leaves two possible explanations for what you are seeing. Either the charge rate isn’t being reported correctly or not all the power is going into the battery (to heat for example).

 

[raijinmach]

One thing I can tell you with certainty is the to 10% will not give you more mileage than any of the “other 10%s”.

So that only leaves two possible explanations for what you are seeing. Either the charge rate isn’t being reported correctly or not all the power is going into the battery (to heat for example).

I've tried it on various L2 chargers and it's the same. It's not heating the car either unless you mean the battery

 

[ChrisO]

Where are you getting the charge rate from?

 

[raijinmach]

Where are you getting the charge rate from?

The app

 

[ChrisO]

Maybe one the experts like @Mach-Lee can give some suggestion on why this might be happening.

 

[mkhuffman]

Between 95% and 100% the charge rate definitely slows down. Your app could be showing what it is offering, not what is getting delivered. As it approaches 100%, the battery cells are getting topped off and balanced so they are all at the same voltage. That is a very slow process compared to the charging at lower charge levels.

 

[Shepherd]

I believe the charging curve is programmed by Ford into the car's software. I recall the curve was updated a few times over the years. There are photos here in threads showing when the state of charge goes up the rate of charge goes down. Not because the last 10% has more capacity. Physical damage to the battery occurs when it's DC fast charged at a high rate for too long. Thus the charge curve ramps it down to where you have to wait as long to get from 80%-100% as you waited to get from 20%-80%.

 

[RickMachE]

The charge rate slows at the very end AND the cells balance.

 

[shelnian]

 

[raijinmach]

Between 95% and 100% the charge rate definitely slows down. Your app could be showing what it is offering, not what is getting delivered. As it approaches 100%, the battery cells are getting topped off and balanced so they are all at the same voltage. That is a very slow process compared to the charging at lower charge levels.

Shouldn't we all know what the app shows?

 

[ChrisO]

When charging look at what you see in the car. That should be actual power delivered.

From what I gather the Ford app is not providing real-time power delivered when charging.

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