12 Volt Battery discharging

Kia e-Niro which offers an all-electric, zero-emissions powertrain
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Bob Greenwood
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Joined: Thu Feb 09, 2023 4:29 pm

Post by Bob Greenwood »

My car is a 2019 1st Edition E --Niro 64kWh.
On 6/02/23 my 12 volt utility battery was flat, i.e. with zero charge. The AA attended and reported as follows:
• Battery voltage 0.8v. Boosted and initial current draw 13amps. Battery charge current 2amps rising to 10 amps indicating 12v battery ok. Parasitic drain of between 2.5 amps and 11 amps When vehicle powered down and locked.
• Plugged car into charger when AA left. Charge record showed 0.2kWh charge, over 21min, initially at 0.8kW then reducing to 0.5kW.
Ongoing activities as follows:
• Car plugged in to charger but not taking charge. Battery voltage measured as zero, but when terminals removed, rose to 1.43V.
• Battery disconnected, removed from car and put on charge.
• Charged to 13.85V. Refitted in car. Set car to Start. Battery reading 14.53V. Main Battery showing 100%. Switch off car. Battery reading 12.7V.
• After leaving overnight (not on charge, headlights off auto), battery voltage zero.
• Removed battery and put on charge.
• Charged to 13.7V.
• Refitted in car but removed Neg battery lead to see if battery looses charge overnight whilst disconnected.

I'd appreciate any thoughts / advise on finding a resolution.

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Joined: Fri Mar 03, 2023 1:26 pm

Post by AlanKB »

I had the same problem and my eNiro 4+ spent 4 weeks in the dealers workshop while they tried to prove what was causing it. It was finally proved to be caused by my vehicle being registered with my energy supplier for so called ‘intelligent’ charging (Octopus). It looks like they keep ‘pinging’ the vehicle to see if it’s connected to a charger and every time they do that the dashboard display back light come on, resulting in a battery drain and eventually a flat battery. I’ve had to unregister my car from Octopus Intelligent Charging and no longer have the problem. It’s been flagged as an issue across ALL Kia EVs. Hope this helps.
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Post by keyshed »

When I went out this morning in my Kia Niro hybrid4 2023 model, I had a notice come up on the screen saying there was a new map update, and would be done over the air. Does anyone know what that means, do I have to keep the car on or will it do the update overnight?


Colin Lambert
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Joined: Wed Jan 30, 2019 12:14 pm

Post by Colin Lambert »

When I bought my year old eNiro, the system warned me that it was out of date.
I checked the web site and it required a massive download onto a massive memory stick (then plug stick into car and download) and I only have 1Mb download speed. You may be ok if you have high speed fibre. If you don't you will have to go to your dealer and get them to do it.
I was most surprised that they too had to download it. I would have thought they might have it already downloaded for customers like me, but apparently not. It was Hendy after all! :roll:
It took them 2-3 hours to upgrade it .
It is vital to update a BEV, otherwise charging stations would be out of date but on a hybrid you won't have that facility (Obviously) on your system, so unless you want an up to date sat nav it may not be worth the hassle.
Ask your dealer what else your version contains.
79 cars so far! Now 71 Reg eNiro 4+ Yacht Blue.
Dip Mech Eng (automotive)
Mod Karoq & HR-V forums.
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Joined: Mon Jul 22, 2024 2:00 pm

Post by Badger3376 »


My 12v Car battery has become flat as a result of the internal light been left on overnight. It will be two days before a charger arrives and I can charge it back up.
Meanwhile, is it normal that whilst the car 12v battery is flat, i cannot open the boot ?
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