Blacksheep wrote:
The battery is being so heavily modified it isn't the same battery any longer:
1. Improved cell manufacturing process
However Boeing is quoted as:
"For every battery in service we have a manufacturing record, so we know how each one of the cells behaved when they were tested. We know today which cells will not pass the screening tests and when they return from the fleet we will reject those cells."
that's here
787 Ferry Flights To Resume
If there is a plan to recycle some of the cells returning from the fleet, then there is no redesign of the cells, and only the
screening is modified. Seems the most likely, because there was not enough time for a cell redesign and qualification of that.