Another 12-volt problem

[Howard_silver]

Enquire whether anyone has experienced this. This morning, I entered the vehicle, and my BM2 indicated a low state of charge and a battery voltage of 10.5 volts. The battery was just replaced with a Yuasa Silver. The vehicle initiated without issue and indicated charging during my 30-minute journey, with the state of charge increasing. Returned to the vehicle thirty minutes later; it started without issue, but the voltage was again low. Arrived home and turned off the vehicle; the voltage immediately decreased again.
I replaced the 12v battery with the old one, which indicated 12.65v, and immediately it began to decline to low 11v readings. The vehicle in utility mode indicates that it is charging properly; nevertheless, there seems to be an anomaly with the battery voltage decreasing despite no active components. I have verified the voltages with a multimeter, and they correspond accurately to the BM2 readings. Are these indications of an impending ICCU failure?

[Screwdriver_1]

That does not seem typical to me. I would recommend having it examined. The voltage off charge should be approximately 12.9 volts when unloaded and roughly 12 volts when activated. During charging or operation, the battery should register approximately 14 volts.

[Howard_silver]

Thank you for your reply. I ventured out this afternoon, and upon returning after an hour, the device was functioning well, displaying no warnings and a battery reading of 12.4 volts. I hope Kia can resolve the issues related to their 12v systems and possible ICCU failures. I have possessed the car since last April, and it is an exceptional vehicle; nonetheless, I lack confidence in it. It may be prudent to examine alternative options.

[MrGreedy]

I will verify that the boot light does not remain illuminated when the boot is closed.

Upon examining the trace on my BM 6 over a 24-hour period (vehicle stationary throughout), there is minimal voltage decline. Until 10:00, the Battery Management System activates to charge the 12V battery.
Provided the drive battery remains over 20%, the Battery Management System (BMS) should maintain the 12V charge, as of 10:00.

[MrGreedy]

[Howard_silver]

Thank you. Mine plummeted unexpectedly on the track yesterday.

[MrGreedy]

Could it be that the drive battery temperature control was activated?

Did you access the automobile through the app at that moment, thereby activating it?

[Howard_silver]

That concludes the responses thus far; I suspect the new battery may be defective. I charged it overnight, and as soon as I disconnect the charger, the voltage declines significantly. Proceeding with additional investigation.