Medical Device, Warranty Influences Expected Service Life

Currently working on the IFU/OM for a digital medical device that has an internal rechargeable battery. We plan on performing accelerated testing in the future, just not yet.
Although the expected service life is an input (let's say we wanted the ESL to be 6 years), the battery manufacturer claims a 3-year life on the battery. My understanding is that the expected service life of the entire device will now be 3 years due to the battery (since that is the shortest defined life of all the other components).

If the company offers a 6-year manufacturers warranty on the product, or more, does that warranty increase or influence the expected service life?

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