i found this info when i was looking up warranty's
(2017 Hyundai Electric)
2017 Hyundai Ioniq to have lifetime battery-failure warranty
"Hyundai is extending the lifetime battery warranty offered on previous electrified models to the 2017 Ioniq lineup as well. The warranty applies to all versions of Hyundai's first dedicated green car, including the Ioniq Hybrid, Ioniq Electric, and Ioniq Plug-In Hybrid.
As with previous Hyundai models, the warranty applies to complete failure of the lithium-ion battery packs in these vehicles, not to any degradation in battery capacity that may occur over time.If the battery pack fails, Hyundai will replace it free of charge and "cover recycling costs for the old battery free of charge to the original owner," according to a promotional e-mail sent to customers.
The warranty does not cover vehicles placed in commercial service, which the e-mail defines as "taxi, route delivery, rental, etc."
Hyundai has offered its lifetime battery warranty since 2012, when it was introduced for the first-generation Sonata Hybrid midsize sedan."