RCZ Battery Draining Error Codes

Sounds like a classic case of parasitic draw, though a bad sensor is plausible. Have you checked the battery terminals for corrosion or loose connections? Even a small amount of resistance there can cause significant voltage drop and phantom drain. Think of it like a kink in a hose – restricts the flow even if the tap is fully open.

Yeah, I checked the terminals – they look clean and are tight. So, if it's not the terminals, and you reckon the sensor is a possibility, is there any way to be absolutely sure before I start throwing parts at it? Or is it workshop time?

Given the symptoms and your troubleshooting, a defective battery sensor is highly probable. It's responsible for monitoring the battery's health and regulating the charging process. If it's sending incorrect data, it could lead to over-discharge. At this point, a diagnostic scan at a workshop is your best bet to confirm. It'll save you guesswork and potential further damage. Expect around 315€ for the sensor and labor.

Thanks a bunch for the advice! Took it to the shop, and you nailed it – faulty battery sensor. 315€ later, and she's purring like a kitten again. Appreciate the help!