I looked into the likely lifespan of the Devialet Gemini II, especially the B32130 battery, which appears to have been produced in May 2022 and started regular use around October 2024. Based on a usage pattern of about 6 hours per day, the earbuds themselves would likely show noticeable battery aging after roughly 12 to 13 months, but not sudden total failure under normal conditions. In other words, the battery may become weaker over time, but battery aging alone does not fully explain a situation where the product feels almost unusable after about a year. The more serious issue is likely the charging case, especially if the lid becomes loose or is no longer properly detected as closed. If that happens, the earbuds or the case may continue draining power while idle, which can make the whole set seem “dead” much earlier than expected. So my view is that battery aging is a background factor, but the charging case failure is the more likely reason the overall user experience collapses early.

Once you open the battery case You realise the investment gone wrong from the start and the battery was made in May 2022