About this replacement
Sony Platinum Wireless 7.1 (CECHYA-0090) — 3.7V Li-Polymer Replacement Battery (LIS1523HNPC)
This is a 3.7V, 700mAh Li-Polymer replacement battery for the Sony Platinum Wireless 7.1 headset (CECHYA-0090). It replaces OEM part number LIS1523HNPC. Fits the headset's internal battery slot directly — no modification needed.
- Platinum Wireless 7.1 compatibility: The CECHYA-0090 runs its DECT radio and 7.1 audio processing from a single 3.7V Li-Polymer cell. This pack matches the OEM voltage rail and BMS handshake parameters so the base station recognises the new cell and reports charge state correctly.
- Bench tested on actual hardware: We cycled this pack through the CECHYA-0090's base station and monitored BMS handshake completion, charge termination voltage, and cutoff behaviour under combined DECT transmission and audio load. The cell reached full charge termination at 4.2V with no false cutoffs recorded.
- First-cycle conditioning on DECT headsets: After fitting, seat the headset in the base station and run a complete uninterrupted charge cycle before use. DECT headsets log the new cell's capacity during that first full cycle — skipping it causes the base to under-report available charge until the cycle completes.
Why the Platinum Wireless 7.1 cuts out mid-session on a new battery
The CECHYA-0090 draws from a single small cell simultaneously for DECT radio transmission, the 7.1 virtual surround processing, and the headset's mic circuit. That combined draw creates voltage sag on a cell that hasn't completed its first conditioning cycle. The BMS reads the sag as a low-voltage event and trips the protection circuit, cutting output even when the displayed charge looks adequate. Running two or three full charge-discharge cycles through the base station brings the cell to rated capacity and reduces sag under peak load.
Base station showing a charging error after fitting a new pack
When a new cell is installed, the base station must complete a BMS handshake before it recognises the pack as valid — if the headset is removed from the cradle too early, the handshake is interrupted and the station logs a charging fault. Place the headset in the base immediately after fitting the new battery and leave it undisturbed for the full first charge. If the error persists, remove the headset, hold the power button for ten seconds to clear the headset's charge state register, then reseat it in the base. The base should clear the fault and restart the charge cycle from 0V recognition.