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The Hyundai Ioniq 5 loses 5-10% battery charge overnight when parked and not charging. The primary cause is the vehicle connectivity module maintaining a constant cellular data connection for over-the-air updates and remote monitoring. Disabling the BlueLink connectivity service via the vehicle settings significantly reduces overnight drain. Enabling scheduled charging and preconditioning also helps manage battery level.
Based on 57 driver confirmations
Noticed the drain was worse when the V2G charger was plugged in even when not actively charging. Switched to a different charger — drain back to normal. Known compatibility issue with certain third-party chargers keeping the car awake.
Parts replaced: None
Was losing 8-12% battery overnight with nothing connected. Hyundai released a software update specifically for this issue. Dealer applied it, drain dropped to 1-2% overnight which is normal for the thermal management system.
Parts replaced: None — OTA software update
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