As the Nissan Leaf ages and more old models are around, battery replacements are becoming a common request. Older LEAF owners can even get a newer 62 kWh pack swapped in to get over 200 miles of range in the original LEAF versions.
There are a number of companies around the world that are beginning to offer Nissan LEAF battery replacement services.
Sal Cameli (UBUYGAS on the Nissan Leaf forum) created a website that he is keeping up to date as more companies offer the service.
To discuss the battery replacement costs and options, there is a thread on the My Nissan Leaf forum: https://mynissanleaf.com/viewtopic.php?f=4&t=31135/