Chriull

If you did not remove the li ion cells from the bms you did try to measure resistance in a live circuitry which will not work out. The changing values could be the ohmmeter trying different ranges? Low battery warning should normal be single cell (groups) beeing below some 2V. Did you measure the li ion cell voltages?

Welcome! If you just paste your youtube links in the post they get "embedded":

It could be bad hall sensor cables or problems with their connector to the motherboard, too. I'd check this before changing the motor!

Battery percentage reported from the wheel is a very simple proportional relation with battery voltage. Some ?3.15...3.3V? is 0% and some 4.1x is 100%. Such a relation is about true once the battery rested for some 15-30 minutes. During charging or burdening this number is extremely off. Also your observation that there is more "charge" in the upper region than in the lower region is true. Especially as 100% is in reality some range from 4.1xV to some 4.2V (or what the cell gets actually charged by the charger) EUCW and afair also darknesbot have some own charge percentage calculation to address these issues. In table 2 at https://batteryuniversity.com/article/bu-409-charging-lithium-ion#:~:text=Li-ion is fully charged,is about 2–3 hours. are some (exemplary) values shown for charged cell voltage and charge percent for cut off/saturation charge. Edit: As above in the battery information remaining mAh are shown there could be some chance that the bms has an coulomb counter showing real Soc all the time?

"Normal" wheels do not drain batteries. Just some ill designed like the Z10, adair some begode with power distribution boards and some ks with firmwares that do turn on the mainboard after charging...

Unjust discrimination is a simple concept. There are many pages to be found on the internet which explains this in detail for interested. As it is used here more often, and in combination with other discriminations from some members we remember that this is not wanted here.

Sounds good. Are the cells still balanced after charging? So no charging possible at all but this 1 min intervalls? That's quite much! Should drain the battery from full to empty in about 1 1/2 month... Seems something is really very wrong with your battery.

Increasing the output voltage of the charger a bit too much could cause the bms to cut off because some single cell group voltages exceed the threshold of something around 4.25-4.3V. Each single cell group with a voltage above 4.2V gets discharged downto 4.2V again after charging. That's a main part of passive balancing. Afair it's reported here that if this happens at all by the V5f Bms the cells could only be discharged by way the high resistors... Otherwise li ion cells settle to some "equilibrium" voltage over time. The higher their voltage, the faster. Could also be some normal/higher self discharge? 0.02V drop er cell imho does not sound unrealistic for the first day after a full charge? Especially if this was not a saturation charge but prematurely cut off by the bms. Or some drain by bms/ motherboard? Is this drop drop constant for the following days?

Yes. With "balancing" i meant the normal passive balancing by the bms. If one charges each cell group to 4.2V, as you propose the battery is perfectly balanced! @matthijs should take care, that the second battery is then charged to an about similar level.

4.25V is the threshold for many/some BMS without tolerance. Some BMS on eg aliexpress specify some 4.25V -0/+50mV. Afair @RagingGrandpa measured ~4.28V as single cell group overvoltage threshold for one specific gotway bms. One could check if the bms charge cut off works. By monitoring with a ahelly plug and EUCW or just manual monitoring? As the Z10 has single cell group voltage monitoring balancing could be checked easily, too. Just check after 6/12/24h how much the cell groups above 4.2V got discharged. Afair here was once a mod shown to stop the "vampire drain" of the Z10: https://forum.electricunicycle.org/topic/13737-a-one-electronic-component-solution-to-fix-the-drain-of-the-one-z-series/ Could be recommended! Balancing this ~0.5V difference would need some full balance cycles.

Ridden miles or time wo stops would be more relevant than time including stops... Different mobo versions or firmware versions should not grant some +30% range... Maybe voltage measurement is with both mobos "misadjusted" at opposite extremes so you can now deplete the batteries more?

Yes! Without the charger providing more voltage the battery can't charge higher. Seems it has not +1. As the difference from your Voltmeter and the mainboard measurement seems to be 2,1V try first to adjust it to 2,1V below 84V and look what the motherboard reports after a full charge. If on goes over 84V motherboard reported voltage one could risk overvoltage alarms. So easiest to try a charge with this charger!

Please stop this political agitation.

There is no accusation or categorization of discriminating or racist "acts". Discriminations won't get better when they are funny, nice or unintended. And it seems to be "used" a little more often by some members. It is not necessary to disparage an entire nation if the products of a few companies show individual quality defects.

Please use no discriminating/racist comments here.