About this replacement
Bang & Olufsen Beocom 5 — 3.7V Li-ion Replacement Battery (3160585)
This is a 3.7V, 900mAh Li-ion replacement battery for the Bang & Olufsen Beocom 5 cordless DECT handset. It replaces OEM part number 3160585. The Beocom 5 is a single-handset cordless phone system, and this cell fits directly into the handset battery compartment.
- Beocom 5 handset fit: The Beocom 5 uses a slim Li-ion cell at 3.7V to power both the DECT radio and the colour touchscreen. The 50.56 x 34.17 x 6.80mm footprint matches the original cell cavity. No modification needed.
- Bench tested on actual hardware: We cycled this cell through the Beocom 5 charge circuit and confirmed the BMS accepted charge from the base station without triggering a fault state. Cell voltage held stable across standby and active DECT transmission loads.
- First charge after install: Li-ion cells in DECT handsets often ship at partial state of charge. After fitting this battery, seat the handset in the base and allow a full uninterrupted charge cycle before use — this lets the Beocom 5 charge controller calibrate its end-of-charge detection correctly.
Talk time shorter than expected after fitting the new battery
Li-ion cells in low-draw devices like cordless phones can take two to three full charge-discharge cycles before the charge controller accurately tracks capacity. The Beocom 5 estimates remaining charge based on voltage curves it learned from the old, degraded cell. After a few cycles on the new battery, the controller recalibrates and talk time should reflect the rated 900mAh capacity.
Beocom 5 handset loses DECT pairing after battery replacement
Removing the battery completely cuts power to the handset's volatile memory. Some DECT handsets store pairing data in RAM-backed registers, and a full power loss clears them. If the Beocom 5 shows "searching" or fails to connect to the base after the swap, re-register the handset from the base station menu. The pairing procedure takes under two minutes and restores full operation.