Battery (Batterie)

Back to topic(s).
Any suggestions regarding the falling battery charge level and, more importantly, the large drop in SOH in a short period of time (today it shows SOH 81% with a mileage of 27,698 km)

Come on, why do you think so much about these values?
And there are enough logical explanations for it. SOC always loses value after charging, especially now in winter. And the SOH may also have a logical explanation. Maybe the previous owner didn't drive it much, or it just sat around for a long time.


Komm schon, warum denkst du so viel über diese Werte nach?
Und es gibt doch genügend logische erklärungen dazu. SOC verliert immer an Wert nach dem aufladen, vor allem jetzt im Winter. Und der SOH kann auch eine logische Erklärung haben. Vielleicht hat der Vorbesitzer ihn wenig gefahren, oder er stand sehr lange nur rum.

SOC I understand, I don't ask anymore.
But SOH...
Previous owner: 0 km to 24500, 10 years, 5% loss on SOH, me from 24500 to 27700 (3200km), 14% loss on SOH. OK, maybe the previous owner took great care of the battery, charged it up to 80%, never let it go below 20%, etc., but is there such a difference?
I'm worried that I'll have to do something with the battery soon. Twizy is used by my 16-year-old son and I thought that until he is 18 and get a normal driving license allowing him to drive a normal car, I would have no problems and free head.

Es gibt auch einen Zeitfaktor, der den SOH beeinflusst. Bei über 10 Jahren kann es plötzlich kräftig nach unten gehen.

Maybe the previous owner drive not much the last years, so the SOH cant reach the aktually value . Also it was sayed , it cant be that a 10 years old battery have a SOH of maybe 90% . You know what i want to say?

As I told you already:

Snorre schrieb: Don`t worry too much about values like SOH, SOC and range.

This quick decrease of SOH is not unusual.
In May 2021 I bought a Twizybuilt in 2012 with 36.000 km an SOH 99%.
Actually it has 43.000 km an SOH 80%.
The SOH depends on two values: kilometers and age!
To me, it seems to be normal that the batteries of 2012 actually all arrived around SOH 80%, even if they have done just few kilometers.
In case that the actual availiable capacity (range) fits to your (sons) needs, don't care about SOH.
Just keep on driving the Twizy and have fun with it.

In case that the availiable range is to low, you should think about a battery conversion to CATL or some other suitable cells.


Back to the drop of SOC after charging is stopped or ended:

When the battery is charged to SOC 100%, at the end the charging power is reduced in steps from 2100 W to 300 W, then there will be some balancing and finally charging will be ended with a battery voltage of ~57,9 V.
When you then plug off the 230 V cable, I'm quite sure, that the voltage and the SOC will only drop a bit and then won't change for a long time, when the Twizy is parked.
Exception:
In case that you own one of the newer charger devices, the 12 V battery will be charged every ~40 minutes, which will lead to a decreasing SOC too.

When you stop charging before SOC 100% is reached, for example at SOC 95%, the charging power is not reduced and there is no balancing of the cells.
In this case the charging power immediately drops from 2100 W to 0 W.
I suppose that this is the reason, why the SOC decreases so much when charging is stopped at a certain SOC instead of ending it at SOC 100%.

If you like to, you can do the following tests:
1.Do a regular charging to SOC 100%.
When it is ended, wait for example 1 hour, then turn on the Twizy and check the SOC in the OVMS webUI.
2. Repeat that test, but stop charging by OVMS for example at SOC 90%.
I suppose that the SOC decrease after 1 hour will be more than in the first test.
3. Repeat test 2, but additionally reduce the charging power to 300 W.
I suppose, that this will lead to a lower SOC decrease.

It would be good to start these tests all at the same SOC, for example from SOC 40% to 90% (100%)