The 12V drainage issue was addressed, in Kona at least, by software update in 2019 - my Kona checks 12V battery every few hours & charges as necessary. Although I know it was a problem before that. I’d be amazed if I5 doesn’t do that as well. I still think the most likely explanation is battery damage when 12V is isolated for shipping/storage. But we’re all speculating- I haven't seen anything definitive at this stage.Please get a BM2 battery monitor & hook it up. This will show you what's really going on to the voltages, and it will be very illuminating to see what treatment the Ioniq 5 gives the 12V. If it's the same as Konas & Ioniq 38s get, then they may not have improved their strategy, and you Ioniq 5 guys can expect a number of vampire drains leaving you with a flat battery. There's been 1 or 2 mentions already of this happening.
Good info Jaz but how long does the 12v auxiliary battery get charged for at 14v.So that your 12V battery discharges as little as possible, when you get into the car, you must always press the brake pedal and turn the ignition on until you see green ”READY”, so that the DC/DC converter is switched on, which charges your 12V battery with 14V. Either you have to go to EV in the infotainment screen -> gear icon right -> scrolls down to see Activity mode and set it on. This does the same, without having to push the brake and put it in the ready position.
- On an ICE version you also let run the engine so that the alternator charges the 12V battery to prevent draining, here on an EV you must only switch the DC/DC converter on to charge your 12V battery.
- the electric motor(s) doesn't run when you are in the READY state as long as your gear selector is in the P position.
- As soon as you put the ignition key on so that the green "READY" is on, the activity mode is automatically turned off.
When you start charging you traction battery, you have to put your ignition off, but once you charge you can put the ignition key in “READY” so that the 12V battery charges too.Good info Jaz but how long does the 12v auxiliary battery get charged for at 14v.
As Andy @HandyAndy mentioned before, a short charge on a depleted wet acid battery is not going to make much difference at all (if any).
Does anyone know if the I5 has a split charge relay fitted to help maintain the 12v battery when the traction battery is being charged via an external power hookup.
Thanks Jaz,When you start charging you traction battery, you have to put your ignition off, but once you charge you can put the ignition key in “READY” so that the 12V battery charges too.
12.7V is 100% OK for a battery with everything switched off.The 12.7v was taken when the car was fully switched off.
The point I make (and in synch with @HandyAndy) is that short bursts of charge while the system is ready/on is not going to make a huge difference to the Battery itself.
Also, if the actual charge being provided from the traction battery is only 13.5v (+) then that's insufficient IMO to support a quality charge for a wet battery. I would personally want a 14.1v constant charge for standard wet batteries and 14.3v if the auxiliary battery was derived from an EFB technology and 14.7/8v for AGM etc.
All the best,