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iOS 18 Hints At A Buttonless Future For iPhone 16, Improved Battery On The Horizon
(www.ibtimes.co.uk)
This is a most excellent place for technology news and articles.
Not to state the obvious, but even if they did go in that direction, you’re not typically sitting there holding an hours long conversation with Siri. The battery life would be drained in proportion to how often you used it, just like phone calls, movies, and heavy games do now.