Kia EV6 Wind battery charging issues

D

David Snively

New Member
Title: “Declining AC charging rate over time — has anyone else seen this on a 2022 EV6?”

Body:

Hello all — hoping someone here has experienced something similar. I own a 2022 Kia EV6 Wind. When new, my Level 2 (AC) charging rate was around 9.4–9.6 kW, which translated to ~32 miles of range per charging hour. Over time, that has dropped to about 6.2 kW despite taking the car in for service multiple times (they even replaced a connector).

Service says it’s a safety feature or normal battery aging. Yet when I use a DC fast charger, the car can charge very quickly — inconsistent with the idea that the battery is so degraded it must throttle AC.

Has anyone else had their AC charging performance degrade so much? What explanations did dealers or other owners offer? And do you think this is something Kia should fix under warranty or goodwill?

Thanks in advance for insight — anything I can bring to the table for my discussions with Kia.

Dave
 
I have a 2023 version and noticed the same thing, though I noticed it after a software update. Because of my charging habits I've never bothered to "fix" it. Overnight doesn't affect me if it takes 4 or 6 hours to complete; by morning I'm ready to go, so, meh... *shrugs*

South Korean ev's are notorious for faster than market degradation, and I assumed they modified the software to try to alleviate some of the effects. Good luck getting a dealership to admit that, especially if they consider it a battery safety(?) issue. Not sure it has anything to do with age though. And I noticed it was faster at the high(er) powered lvl2 charger at my mothers (48A vs my home charger at 30A); it still produces 9.6kW there.

As far as DC charging time, it is more noticeable to the user, uses different charging components, and has a known effect on batteries (fast = faster degradation, no matter the DC level of fast), so they didn't bother to change it noticeably? They may have changed the charging curve though; I seem to remember it charged faster for longer, but I don't have proof, and, well, quite frankly, I can't match the other environmental factors that effect the DC charging curve, so... *shrugs again*

I'd be interested if anyone else has seen similar effects and if there was an exact date (i.e.: software update) that changed it.
Jon.
 
Hi do you charge to 100% 0n AC and or only on DC or not at all to 100%,
the reason is 100% in needed to balance the cell voltages, starting with AC and the Dc after,
i have found i need to do this every 3 months or so with my Kona - 64kwh battery
 
I have my 2021 Kona with 64kW battery for 5 years and over 88,000km. I never heard this need. I charge to 80% at home normally and to 100% before long trips. At the DC chargers I used to charge to 100% on long trips, but cut it back to 90% after discovering the it takes for ever to charge from 90 to 100%. I have not noticed any battery degradation or range loss to date. And my cells are balanced.

Where did you get your info for the need to ‘balance’ your battery cells quarterly?
 
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