Just got reply from Ather team that they are aware of this trend in the discharge of the battery in the vehicles. This is being monitored by the team. They should be able to come with a resolution for this in the future over the air update.
Now that we have @Shreyas attention, asking one of the questions I had asked few times but yet to get an answer
I have consistently tried and confirmed that the battery % is wrong after full charge.
Charge to 100% and drive for 500 metres and the SOC drops to 97%. Drive for few more kms e.g 5 kms at 7%. Now, dashboard shows 90%. Shutdown the vehicle and turn the vehicle ON after few hours. The battery % will be 93%. I believe that the increase is because of the initial drop which was wrong.
I have verified this quite a few times and can be reproduced every single time.
Now the question:
Why does it happen and can this be fixed?
Off the top of my head there are 2-3 things that can cause this:
1. Measurement and calibration of voltage vs SoC.
2. Voltage ‘Bounce back’,
A commonly used term that is used for a phenomenon for Li-ion cells. During high current draws, the voltage across terminals drops lower than the open circuit voltage, or the voltage for lower current draws.
This happens on account of internal vs external resistance changing constantly.
Which means it is extremely difficult to measure the instantaneous SoC and you cannot rely on the voltage alone. Based on the average current drawn, the value of the displayed SoC has to be fine tuned.
3. Sudden drop in voltage for the initial draw.
This again can be one of the factors that you see because of which the SoC suddenly drops for the initial few kms. Especially if the acceleration is high as soon as the vehicle starts.
4. The last thing that may be happening can be
Once the vehicle gets fully charged, the charging point cuts off power and the battery goes into the idle state. After which the charge goes down by a certain value. After a while it restarts charging back to 100, and the cycle continues. It may so happen that you remove the charger during the idle stage when the battery is discharged by a small amount and as soon as you start moving the SoC drops.
This question was answered by Chaitanya. He said it was due to some software algorithm mismatch due to which it was jumping by 2%. He also said it will be fixed in the next OTA update.
Reason I am asking is with what happened today:
Today, I forgot to charge and noticed SOC was 18%. I waited until it reaches 40% and started the vehicle within a minute of removing the charger. Now, I drove for max 200 metres and SoC was back to 38%. No way, it was because of acceleration or discharge.
So, one learning. Once it reaches 28%, 38%, 48%, no use in waiting until it reaches 30%, 40% or 50%, because the wait is not worth as its going to go down anyway within 200 metres.
There are multiple things which might happen if you start driving immediately after charging as the SoC in 450 is measured using voltage method. This is true after Shutdown and restart too. Sometime back, Shreyas was narrating about voltage bounce back phenomenon. It is bit technical and variation is bound to happen. Suggest you/we to use battery% on dashboard as a guide.
My first home charging experience… I plugged it in to Pod when it was 85%. It said that it was installing updates for 5 minutes (even though i was on the latest 4.0.4.* version), then began charging with estimated time for completion displayed at 1.30 hours. I checked on it after 3 hours, it was at 100%, but did not say charging has completed. It said that was still charging, while indicating 100%.
Unplugged, and replugged it from the vehicle, resumed charging at 100% percent. I don’t think this is right… Will check by charging again later to see if this continues to say charging at 100%
The auto cut off at 100% doesn’t look like is working for me. It says “charging” indefinitely in the app and dashboard… and the Dot keeps blinking green indicating that it is still charging. I have raised an issue through the app. I am not sure if there will be other detrimental effects if I leave it plugged in for several hours at 100% SoC.
Well, even though dashboard might show 100%, it might continue to trickle charge for several minutes. For sure there won’t be any adverse affect. You can continue charging and see that it will stop after a while. Not that charging is controlled by 450 and not by charger.
However if you are not using 100% charge distance (i mean to say 80-90Kms a day), I suggest you to stop charging at 80%. 80-20 rule is best to adapt for longevity.
Sure, will keep it in mind, although it is cumbersome to manually monitor it until it reaches 80% and then go to the vehicle to unplug it. Hope it can all be controlled in the app, in the near future.
Yes, it is the wish list to have app based cut off. However we need to do it manually now. What I do is, I will note down the time to reach 80% and set an alarm in my mobile.
Well, how should I answer? Hope you have read this post in FAQ.
In simple words, you can charge overnight without any issue as 450’s BMS takes care of everything for an easy going person. With this it should last long the guaranteed life span.
However, if one wants to pull the life span of the battery even longer , then applying 20-80 rule (some book says 40-80) is even better. That way you can stretch even more.
In another analogy, it is like stretching life span of human life by balancing food, sleep and regular exercise
As I understand, only 2.4KWh is usable in 450 which depicts 100% capacity. (even though 450 has 2.7KWh, 0.3KWh battery is not usable and has no connection with the capacity)
In other words i.e. 2.4KWh means 100%, 1.92KWh is 80% .
