I am considering purchasing a new Lexus NX 450+ which I expect to keep for several years.

If I maximise the use of the PHEV battery, it occurs to me that PHEV batteries are likely to be more highly stressed then EV batteries. With a range of ~40 miles it could go from fully charged to empty in less than an hour and be recharged more frequently.

I am assume high disharge rates and number of charging cycles both reduce battery capacity. If dealer serviced, the Lexus has a warranty cover that extends to 10 years but I can not establish the loss of capacity that would result in a free battery replacement or repair.

So far the local dealer has verbally suggested less than 70% capacity would prompt a free repair, but is yet to confirm this in writing, Lexus customer services are providing opaque answers, and the information on the Lexas website is less than helpful.

Clearly, some loss of capacity would be expected but given battery range is the USP of a PHEV it's important to me to understand how significant this could be and the extent of warranty cover.

Are you able to advise if PHEV batteries are typically more vulnerable to capacity loss than EV batteries?