This will also fit the Mavic Air 2, Mini and Mini 2 Battery 

L-Battery Protective Storage Bag LiPo Safe Bag Explosion-Proof for DJI Mavic Air Feature: 100% Brand New. Perfect fit for DJI Mavic Air Battery

Type: Small Size (for 1pc battery)

Medium Size(for 2 pc battery)

Dimensions:

9.4*6*5.4cm (S) 

10*9.8*5.4cm(M)

(Note: manual measuring sizes, there might be 1-2mm error.)

Batteries are not included.

Package included 1x Battery Safe Bag for DJI Mavic Air battery