We replace all our 3 year old IC40s, unconditionally at 3 years. They still work fine but once warranty period is over we swap in new equipment, same as with all our switches, routers, laptops etc.
Swapped out all our pools and I typically keep one or two spares if I need to do maintenance or diagnostics.
Have a single tested IC40 cell, if anyone is in need of one but as is normal disclaimer caution, it can of course be a total waste of time and resources. Payment via Paypal and I can ship it via UPS, 50 plus 20 for shipping.
Here is the Amazon link for this item