How long will Alea's batteries last? Brad August 13, 2021 22:02 Updated More than 1 year and depending on usage could be 12-18 months. Related articles Will I be notified when I need to change Alea's batteries? Can I buy Alea if I live outside of the USA or Canada? How do I control my Alea vents? What about air registers? Don't see the Alea size that matches your opening? Comments 0 comments Please sign in to leave a comment.