CR Z weak starting battery

I understand you're experiencing starting issues with your Honda CR-Z. Could you please describe any efforts you've made to troubleshoot the potential 'Terminal 30' issue? Furthermore, have you observed if the voltage drop occurs consistently or under specific environmental conditions?

Thanks for the reply! To be honest, I haven’t done much beyond looking at the fuses in the fuse box – all appear ok, none seem visibly blown. I don’t know how to check voltage drops or anything like that; never done that myself. It seems worse when it’s cold, maybe that is useful?

Given that your initial inspection of the fuses yielded no obvious issues and considering the symptom's correlation with colder ambient temperatures, it might indicate a depleted or defective battery. It would be prudent to schedule an appointment with a qualified automotive technician for diagnostic procedures, specifically targeting the battery and charging system. This should ascertain the extent of the voltage drop.

Yeah, I think you're right, time to bite the bullet and take it in. The workshop confirmed it was a heavily discharged/defective battery and the bill came to 290€. Thanks for guiding me to the pro's!