Question about charger

Hello, I bought a Nitecore Intellicharger new I4 a while ago and still have not found an answer to this.
When I am charging 1 battery all 16 LED lights will flash then it will continue to charge for 5 seconds then do it again.
I have tried it will multiple batteries and its always the same.
If I charge 3 batteries at once it does not do this.
Nitecore are not responding to my emails and cannot find an answer to this online.

Any help appreciated.

Thank you.

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