It's tight with the standard, so don't think you could go much larger.

Even with what you mention, I don't believe the draw would be that great, around half an amp (i.e. 500 Ma) I should imagine, which the charger should have no issue with.

@bigdel yes I have noticed this, with the positive and filed the terminal slightly to get the plate to sit.

I have a Tayna.

Martin