After you get your batts on your charger you might want to 'roll' them. How do I explain this?
Take your finger, lay it across your batts as they are seated in the charger, and gently roll your finger over them.
This can help to seat your batts properly in your charger. More than once I have put batts on the charger, only to discover one was not properly seated in the charger.
Happy
vaping,
Paula