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Comment by shams93 | Hacker News Reader

My mom doesn't understand that her car isn't broken, any modern car has to be driven daily or all the extra stuff will leach that battery.

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Haha, this is true. What's frustrating is that my PHEV has 12kw of battery, but I can't let it sit for more than a week without needing to jump it because they can't charge the 12v battery off of the drive-train battery system. DOH!

Hyundai Ioniq5 had a bad issue with the bluetooth polling some server thousands of times a second. It drained the 12V battery not the main battery but it meant you couldn't start the car. It was a huge problem that took a long time to figure out, so stupid.

My cars both have an app and full cellular connection (2020 and 2023 model years) and they can go two weeks without a risk of not starting. Haven't gone longer though.

It's broken by design

If you want the simplicity of pressing a button on keyfob or just walking up and opening the door with NFC unlock, then by design something is going to be draining the battery very slowly.

The fact that that can't run off of some auxiliary battery pack that can die without killing your starter battery is just silly.

Much better just to have a backup key system to unlock the door, but still have the car start.

some cars have a long-term sleep mode. you pull the handle to switch the keyless stuff back on. this still drains the battery, but even slower.

of course, that can malfunction also.

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