For my JK v19 BMS battery on CAN-bus , on Ekrano GX I used to periodically check Details > Lowest cell voltage and Highest cell voltage. Both values used to be shown with a 1mV precision - as provided by the BMS. After the recent OS upgrade to Venus 3.70 both values are now with two digits precisio…

Same here with PACE BMS [image] Before it was 3 digits. @dognose Is this a bug or a feature?

I was referring to Ekrano GX screen as well as Ekrano access via LAN. Same picture as @Martijn provided.

[image] Venus 3.70 - lowest and highest cell voltage - reduced precision after upgrade New UI Same here with PACE BMS [image] Before it was 3 digits. @dognose Is this a bug or a feature? This also the case in v3.71~2

While i do agree that the UI should be consistent across displays, console and VRM, i doubt that any BMS out there offers millivolt accuracy, so comparing mV readings between cells is pointless.

@chirgu, I agree absolute accuracy is not needed, but relative accuracy can be very helpful. I have 32 lifepo4 cells from three different batches, and my BMS is set to trigger balancing at 5mV difference. I need to monitor how those cells behave beyond the flat portion of the charging curve, as they…

[image] chrigu: i doubt that any BMS out there offers millivolt accuracy Doubt is good, it keeps you sharp. But I can assure you you are mistaken. On our batteries we flag issues as soon as there is a voltage difference > 5mV over all cells over the full operational range.

I will get back to this, a 12 bit ADC (or above) with accurate / calibrated components should be able to measure this, or at least with the noise part being in the mV range.

[image] Jan: BMV Smartshunt has a 20 bit ADC, That is something else, yes a smart shunt is accurate. This is about 3rd party BMS-es.

[image] Jan: On our batteries we flag issues as soon as there is a voltage difference > 5mV over all cells over the full operational range. For a mV reading we should expect the tool that measures it to be accurate to 0.5mV, so that the inaccuracy disappears in the rounding. And thats what i …

Venus 3.70 - lowest and highest cell voltage - reduced precision after upgrade

Q&A and troubleshooting New UI

UpCycleElectric (Jan) 13 March 2026 21:39 11

In a recent discussion we established that the BMV Smartshunt has a 20 bit ADC, a search should surface that discussion. 12bit is by todays standards, prehistoric

EDIT: 24bit:

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Venus 3.70 - lowest and highest cell voltage - reduced precision after upgrade

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