There are no options when it comes to batteries for the Inspire. You need to get a TB47. You may still find the larger capacity TB48 around, but these are no longer available from DJI. DJI make a 100W and 180W AC charger for this battery and there is also a car charger available.
Check out the DJI website as all the accessories currently available are listed there.
Yep. I believe it is due to shipping regulations as they are over 100WH.
You may find a few places with them in stock but I know the guys up here in QLD at Rippit Hobbies can't get them and they no longer show up in the DJI Store.
I just orders 1 today will phone and let you know what the go is. If I may ask what do you use your inspire for I am new to the inspire and want to use it for survey