About this replacement
Sony XDR-P1DBP — 3.7V Li-Polymer Replacement Battery (SF-03)
This 3.7V, 1100mAh lithium-polymer battery replaces the SF-03 cell in the Sony XDR-P1DBP portable DAB digital radio. It fits directly into the XDR-P1DBP battery compartment and restores wireless operation for DAB and FM reception. Capacity matches the original Sony specification at 4.07Wh.
- XDR-P1DBP platform fit: The SF-03 uses a slim 57.00 × 43.15 × 4.20mm lithium-polymer cell format specific to this Sony portable DAB receiver. The connector and cell dimensions are matched to the original battery bay — no adapter or modification needed.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the XDR-P1DBP. The BMS accepted charge from the radio's onboard charging circuit without fault, and the cell held voltage within the tolerance the DAB decoder requires to maintain stable stream decoding.
- Station list re-scan after install: After fitting this battery, let the XDR-P1DBP run a full auto-scan before manually selecting stations. The radio stores its DAB station list in volatile memory — any power interruption clears it, so a fresh scan rebuilds the full multiplex list correctly.
Radio cutting out mid-station at low battery on the XDR-P1DBP
The XDR-P1DBP's DAB decoder requires a stable voltage rail to process the OFDM signal and reconstruct the audio stream. When cell voltage sags below roughly 3.4V under load, the decoder drops frames and the audio cuts or mutes entirely — even if the radio still appears powered on. This happens earlier in a degraded original battery because internal resistance rises, causing voltage to sag harder under the RF and decoding load. A fresh SF-03 cell eliminates that sag and keeps the decoder fed at the voltage it needs through the usable charge range.
Battery draining faster in poor DAB reception areas
In weak signal areas, the XDR-P1DBP increases RF search power as it hunts for a usable multiplex — this draws significantly more current than normal playback. A degraded battery accelerates this problem because higher current draw compounds the voltage sag, tripping the low-voltage cutoff sooner. With a new SF-03 at full charge, the radio has the headroom to handle those search cycles without cutting off early. If drain is still heavy, check signal strength in the radio's diagnostic menu and consider repositioning the aerial before assuming a battery fault.