Dealer's playing dumb, sent me an invoice for $24,283.10 for the diagnostics plus battery replacement. The service advisor claimed he looked up & down for warranty info before sending this to me.
He also had the vehicle description wrong, listing my C-Max Energi instead of the Focus. After getting that right, I opened a case with Ford, who suggested the service advisor should talk to his local warranty rep from Ford.
edit: It looks like, in fact, I might be in the wrong; as it has 102K miles, and it's a ZEV not a PZEV, its warranty might have ended at 100K miles. It has 102855 right now. I guess I'll have to see what the dealer warranty rep has to say about it. I was under the impression BEVs were covered for 10yr/150K in CARB states, but that's only for PZEV, not ZEV (i.e. BEVs).
2017 Ford Focus Electric (Magnetic)
2017 Ford C-Max Energi SE (Kona Blue)