Shokz Openfit T910 Replacement Battery LI267 3.7V 600mAh

shokz Openfit T910 Charging Case — 3.7V Li-Polymer Replacement Battery (LI267)

This 3.7V, 600mAh Li-Polymer cell replaces the internal battery in the shokz Openfit T910 Charging Case. When the case battery degrades, the case can no longer store charge to top up the T910 open-ear headphones away from a wall socket. Swapping this cell restores that on-the-go charging function.

• Openfit T910 Charging Case fit: The T910 case uses a slim Li-Polymer cell at 39.30 × 25.70 × 4.60mm to fit the tight internal cavity. The cell must match this footprint exactly — a thicker or wider cell will prevent the case from closing and may damage the charge management circuit.
• Bench tested on actual hardware: We cycled this cell through the T910 case charge controller on the bench. The BMS accepted the pack without error, balanced charging current correctly, and the case passed charge through to the headphones at normal output voltage.
• First charge after installation: After fitting, run the case down completely on its first cycle before recharging. The T910 case charge controller recalibrates its fuel gauge on the first full discharge-to-charge cycle — skipping this leaves the indicator reading inaccurate.

Why the T910 case stops charging the headphones before the indicator shows empty

The T910 case charge controller cuts output to the headphones when cell voltage drops below the protection threshold, even if the indicator LED still shows a partial charge. A degraded cell loses voltage faster under the combined load of charging the headphones, so the cutoff triggers earlier than the indicator predicts. A fresh 3.7V nominal cell restores the voltage headroom the controller needs to complete a full headphone charge cycle. After fitting, the first full discharge cycle re-syncs the fuel gauge to the new cell's actual capacity.

Case shows charging but headphones are still dead after sitting overnight

This usually means the case cell dropped to storage voltage — below roughly 3.0V — and the charge controller entered low-current recovery mode instead of normal charging. In recovery mode, the case draws only enough current to slowly raise the cell voltage before switching to standard charge; it does not pass power to the headphones during this phase. Leave the case on USB power for at least two hours before checking the headphones. Once the cell clears 3.2V, the controller exits recovery mode and normal charging resumes.