i3 Battery charging - Degradation real life experience

[Clanduncan]

!20Ah. This is my readings. Built FEB ‘22

Cell voltage deviation seems to be the key value?

This was at 92% which might be the reason for the slightly lower level than the 100% numbers @Clanduncan has seen

Hiya, Mine was produced via 'Electrified', but what app do you use to produce those figures?

 

[alohart]

Cell voltage deviation seems to be the key value?

Correct. Voltage is actually measurable whereas charge level and capacity are calculated values that aren't as accurate. Voltage is what the cell charge level balancing algorithm uses assuming a correlation between voltage and charge level, usually good but not exact.

 

[alohart]

I will post again in a few months after leaving the car plugged in and charging for as long as possible.

I will be surprised to see an increase in usable capacity no matter how long you leave an EVSE plugged in because the maximum cell voltage difference is only 0.004V, assuming that the voltage can be measured with such precision. That suggests excellent cell charge level balance already. The Electrified app displays a precision of only 0.01V, so the Electrified app would show perfect cell charge level balance in your battery pack.

 

[alohart]

Hiya, Mine was produced via 'Electrified', but what app do you use to produce those figures?

That looks like the relatively new eFlow app. Its license fee is more than I'm willing to pay when free apps like mi3 (iOS) and Electrified (Android) display the same data.

 

[i3m3fan]

!20Ah. This is my readings. Built FEB ‘22

Cell voltage deviation seems to be the key value?

This was at 92% which might be the reason for the slightly lower level than the 100% numbers @Clanduncan has seen

Oh that's flow or mi3 ??

 

[Gonville]

Hiya, Mine was produced via 'Electrified', but what app do you use to produce those figures?

The Bimmercode folks. They called it initially Bimmerflow but have changed the name to ‘eFlow’.

 

[Gonville]

Oh that's flow or mi3 ??

eFlow

 

[Gonville]

That looks like the relatively new eFlow app. Its license fee is more than I'm willing to pay when free apps like mi3 (iOS) and Electrified (Android) display the same data.

That’s true but it’s bundled for us and it was a one off. I appreciate supporting these app developers as many nice ‘free’ apps I have had in the past have a tendency to fail to be updated as the operating system moves on. I did it mainly to try and gain knowledge to support the charge to full mantra.

 

[Gonville]

I will be surprised to see an increase in usable capacity no matter how long you leave an EVSE plugged in because the maximum cell voltage difference is only 0.004V, assuming that the voltage can be measured with such precision. That suggests excellent cell charge level balance already. The Electrified app displays a precision of only 0.01V, so the Electrified app would show perfect cell charge level balance in your battery pack.

eFlow is giving that 0.4mV variation on mine as well so 3 decimal places so I am assuming that’s the data in the BMS?