Will it work with the mini 2?

Although the international version of DJI Mini 2 can use Mavic Mini's battery, the power will decrease and the total weight will exceed 250 g, requiring registration in some countries and regions. PER DJI WEBSITE

Is the mini battery compatible with the mini se drone?

Old type battery can be used by new model. But new battery cannot be used by old model.

What is the Cell count of this battery?

Sorry I can't help you. I'm still waiting for my order of batteries to ship.

Can this battery be used for dji mini se?

This battery can be used by Mavic Mini 2 which is sold in Japan. It seems Mavic Mini2 and Mavic mini SE are the same. However new battery for Mavic Mini2 doesn't fit with Mavic mini.