Why does the start-stop function keep showing "Battery Optimization" and not work? Is there an issue with the battery?

I suggest you consult a 4S dealership.

Hey Koleos experts, have any of you experienced this situation?

I use my car every day, but this problem makes it unusable.

The battery is dead. Just drive it a bit and recharge, and it should work fine.

In this case, it's likely a battery issue, meaning insufficient power, so the auto start-stop feature isn't working. It's best to have the battery checked at the shop.