About this replacement
Sony HBH-DS970 / HBH-DS980 — 3.7V Li-ion Replacement Battery (LP1022L15)
This is a 3.7V, 120mAh Li-ion cell for the Sony HBH-DS970 and HBH-DS980 Bluetooth stereo headsets. It matches the OEM part numbers LP1022L15 and GP1022L15. Dimensions are 21.75 × 9.90 × 9.90mm — physically identical to the factory cell.
- HBH-DS970 and DS980 compatibility: Both models share the same cell format, voltage rail, and BMS handshake. The connector and PCB pin-out are identical across the two headsets, so one cell covers both.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the HBH-DS970 platform. The BMS accepted the new pack without fault codes, and the protection circuit responded correctly to both charge cutoff and low-voltage cutoff thresholds.
- Base station conditioning on first use: Seat the headset in the base station and charge it through one full uninterrupted cycle before your first call. The base needs to complete a full charge pass to log the new cell and begin reporting talk-time estimates accurately.
Why the HBH-DS970 cuts out mid-call on a new battery
The DS970 runs both the Bluetooth audio codec and the radio transmitter simultaneously. That combined draw on a cell that has not yet completed its first full charge cycle can pull cell voltage below the BMS cutoff threshold momentarily. The BMS reads this as an undervoltage event and shuts the headset down to protect the cell. Running two or three full charge cycles brings internal resistance down and eliminates these transient sags under load.
Base station shows full charge but headset cuts off after only a few minutes
A replacement cell shipped at storage voltage — typically around 3.6–3.65V — can trick the base station into reading near-full capacity before a proper charge cycle has run. The base reports full, but the actual usable charge is shallow. Place the headset in the cradle, let it charge uninterrupted until the indicator confirms completion, then drain it through normal use before the next charge. After three to five cycles the cell's state-of-charge calibration aligns with the base station's reporting, and the cutoff issue stops.