500e 12V battery issue?

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demu_12

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So I picked up this used 2016 500e recently. Yesterday, on my way to the mall, the car's electrical system warning light came on. I tried restarting it a few times, but it wouldn't go away. I even disconnected the humidity sensor, but still no luck. Weirdly enough, I managed to drive it home for a bit. I checked the battery and it seemed fine. Thinking I could fix it, I went to disconnect the battery, but I accidentally disconnected the wrong thing. After waiting a bit and reconnecting everything, the car was completely dead. I tried everything, but it still wouldn't start. I'm getting pretty frustrated. What do you think could be wrong? Is it the battery?
 
So I picked up this used 2016 500e recently. Yesterday, on my way to the mall, the car's electrical system warning light came on. I tried restarting it a few times, but it wouldn't go away. I even disconnected the humidity sensor, but still no luck. Weirdly enough, I managed to drive it home for a bit. I checked the battery and it seemed fine. Thinking I could fix it, I went to disconnect the battery, but I accidentally disconnected the wrong thing. After waiting a bit and reconnecting everything, the car was completely dead. I tried everything, but it still wouldn't start. I'm getting pretty frustrated. What do you think could be wrong? Is it the battery?
Absolutely! The most common culprit for a no-start situation is the 12V battery - just like with any car. Srsly, you’ll want to grab a Bluetooth monitor like the BM2 to keep tabs on it. That way, you’ll know for sure that your ride won’t leave you hanging.

Trust me, that car's 12V warning is super chill - it only bothers to give you a heads-up when the battery’s almost toast
 
Sorry to hear that. Definitely a stressful situation, especially with a newly purchased used 500e.

While you checked the battery and it seemed fine, it's possible it's still the culprit, even if it's showing some voltage coz sometimes batteries can have internal damage and not hold a charge properly.

Since you accidentally disconnected something while trying to disconnect the battery, it's also possible you've tripped a fuse or even damaged a connection. Beyond that, it could be a more serious issue with the car's electrical system, like the alternator (if it has one), the voltage regulator, or even the car's computer. Since you've already tried a few things, it might be time to call a mechanic or a roadside assistance service.
 

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