This thread is from 2017 and the OP was banned from the forum a long time ago.
You will see his username is crossed through meaning he was ejected from the community.
It is still listed on DJI site @ $239 each.
A few other sites list it too... MapsMadeEasy.
If it works, not a money saver... but does provide new batteries... how old on shelf?
I’ve tried similar swapping quickly the I1 top with M600Pro TB48S (own both) without success due to IC board not compatible with I1. Wouldn’t even power up correctly and be recognized by App.
In his photo it does show a TB48D, with just top swapped... so maybe a venture to buy 1 and try, someone might confirm accurate. Powering up is a given, just battery contacts, although being properly recognized is an unknown.
The M600Pro TB47/48S can be used, but requires both top and IC board off old TB48. Take it all the way down till battery shuts itself off to re-sync the logic.