What battery size suitable for NV1180?

Dsoon NV1180 is mini night vision binoculars that was launched over months, which is welcome in the global market.

We are always asked what size/kind of battery is suitable for this mini device during our official social network, questions like below:

1>Does it take the larger 18650 with included overload protection or the smaller 18650 without?

2>Do I need a flat top or a button top?

The pic is for reference:

1> 18650 battery is suitable

2>without protection plate

3> a flat top

Also, here is a video how to use it correctly: