In 2019, Bose made the decision to discontinue the original Sleepbuds model.
They did so citing "inconsistent battery performance and the device not charging fully or powering down unexpectedly or both." The Sleepbuds 2 product was introduced to improve on the weaknesses of the original model.
Mentioned in this answer
Sleepbuds 2 by Bose
Better sleep, all night, every night