The 12v battery died!

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 Last Friday I went to open the car and ... nothing! Totally dead! It turns out the the 12v battery died. I opened the car with the key and popped the hood, but that was about all I could do. I called Hyundai Assist, and 45 minutes later the AA man showed up. He checked the battery and sure enough it was dead. He connected his jump starter and we started the car ... immediately the battery started charging OK. We let it charge to a good level, switched off and kept monitoring the usage. It took a good 15 - 20 minutes to "calm down" but eventually it settled at about 0.2 amps which is OK. It is a 66 amp-hour battery, so it should last over 2 weeks without use. The previous day I had driven 48 miles ... and yet the battery discharged.

My good lady was meantime googling, and found this YouTube video: IONIQ 5’s 12-volt battery is dead: here's how I jump-started it. It is a good watch!

I followed his advice and bought a battery monitor and installed it. I used additional nuts on the battery as I failed to move the ones that were there! Here it is connected to the battery:


I also bought a portable jump-starter:


It is stored in the frunk ... when there is no 12v battery you cannot open the tailgate and have to clamber into the back via the back seats!

Apparently there is an upgrade that will fix the problem. I called my dealer to ask about it, and I am going there later this week. I will update with the news.


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