Slider for charge percentage not accurate?

We should start a petition.

 

Yea...no.

I set to 80% and it charges to 80%.

Are we really down to this level of conspiracy theories?

 

Wow, that is a dirty trick! 1% of battery charge sneakily hidden away by the UI. /s

 

90% is 90% for me whether I set it in the app or the car. No issues at all.

 

Instead of having a slider bar to set the charge limit at 80% or 90% or whatever, there should be actual numbers, and an up or down arrow beside them to change the numbers. Easy solution.

 

so i'm going to go out on a limb here and maybe even talk a little bit out of my ass but here goes...

an educational guess as to what is "actually" happening involves some math that are not visible to you and me. the "drawing" of the gauge percentage is a poor representation of a limiting factor set within constraints of the battery.

here's why i say this:
you cannot think of the battery as a container. it is not some magical can used to store a finite amount of electricity that is then passed on to a motor for consumption. all batteries rely on a chemical reaction that passes electrons from one source to another. the chemical process within the battery is what returns the electricity for use.

what this means is, while we can accurately rate the amount of energy (electricity) being transferred IN TO a battery, the chemical reaction to extract that energy is not a 1:1 product and there are losses and inefficiencies that take place. what this means is we need to use a little bit of math to determine how much remaining energy is left and attempt to represent it on a screen for us to understand.

the long of the short of it is, it's not a perfect science. we can't just look at the measurements of a cup and know exactly how much energy is left.

does anyone remember when AA batteries used to have those strips on the side that when you push the + and -, it would tell you how "full" your battery was?

 

Looking at this just made my thumbs hurt lol

 

This is an outrage!

 

When I set 90% on the app, it charges to 89%...

 

The lengths people will go to to avoid happiness....

 

I observed this when the ambient temperature falls below 30F. When charging from 50% to 80% using the app, the scroll bar when it hits the grid bar it shows 79%, but as the car start charging it recovers to 80%, but towards the end of the charging session it shows 81%. In addition to this, there is also a 1% discrepancy between what was shown on the battery indicator (both the app and the car) and the data pulled through external data logging software (in my case Teslamate). I think there are several factors (temperature, rounding errors, other unknown) affecting the values shown in the battery indicator. I think reverse engineering to understand the exact math behind it is not going to be accurate. I don't think there is any conspiracy.

 

Charged past the limit that i set

The above thread might shed some light on the issue in this thread.

 

That thread title is a bit harsh don’t you think?