Traction battery charging suggestions

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21KonaER

Member
When we purchased our 2021 Kona (64kWh ext. range) in Feb 2025, the charging settings were AC: 100% & DC 80%. For the last 8 months or so I've lowered the AC setting to 90% as I've heard that continuous charging to 100% is not the best for the battery, and that last 10% takes almost forever using the 10A home trickle charger. Although there is some ambiguous wording in the Owners Manual about charging to 100% every few months, especially if the battery is regularly discharged down below 20%.
May I ask what are the recommended charge settings among log-term Kona EV owners please?
Thanks, Ian
 
21KonaER said:
When we purchased our 2021 Kona (64kWh ext. range) in Feb 2025, the charging settings were AC: 100% & DC 80%. For the last 8 months or so I've lowered the AC setting to 90% as I've heard that continuous charging to 100% is not the best for the battery, and that last 10% takes almost forever using the 10A home trickle charger. Although there is some ambiguous wording in the Owners Manual about charging to 100% every few months, especially if the battery is regularly discharged down below 20%.
May I ask what are the recommended charge settings among log-term Kona EV owners please?
Thanks, Ian
Click to expand...

There's a long running thread here about not letting your SOC to go below 40% ... The 12V battery doesn't regulary get topped off when SOC gets below 40%. (Above 40%, this 12V top-off occurs about every 4 hours.) If below 40%, this CAN result in a dead 12V & unable to start your KONA. (I found this out myself with my 2020). I used to allow my SOC to get down to <20% before charging (Home / 240v charger). I don't drive much and seldom need to charge more than 1-2 times per month. After needing to replace my 12V about 3 months ago, I no longer allow my SOC to get below 40-35%. As far as the upper end, I've read here or someplace that when you charge to 100%, the batteries all recalibrate to some extent. So my habit is to charge to 100% about every 5th charge vs 90% on a regular basis.
 
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