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I've only heard of like one battery pack that has seriously failed so far. . Having said that if the car is 10 years old and has say 150k mi on it you might need to expect to spend at least $5k within the next 5 years to replace the pack. There are some Prius cars with 10+ years and at least 200k mi that failing but those packs are NiMH .. the C-MAX was one of the first hybrids to use lithium ion packs so it's still a bit of a guess as to how long they will last. Batteries kept in the same environment as humans will last longer. Battery sitting outside in the AZ sun or used as a taxi, not so much ..

The problem with that might actually be lack of use. If the battery is left to discharge for a long time you might have other issues, but a low mileage 2017-18 from a climate that's not overly hot or too cold might maximize your longevity.