ChatterBox CB-50 Replacement Battery 2.4V 700mAh Ni-MH

ChatterBox CB-50 — 2.4V Ni-MH Replacement Battery (CB50-BATT)

This is a 2.4V, 700mAh Ni-MH replacement battery for the ChatterBox CB-50 wireless headset. It replaces OEM part CB50-BATT. The CB-50 runs its DECT radio and audio circuits off this single cell pack, so a degraded battery affects both transmission range and call clarity.

• CB-50 compatibility: The CB-50 uses a 2.4V Ni-MH cell at this exact form factor — 44.50 × 20.50 × 10.50mm. The base station charges and monitors this pack directly. Voltage, connector, and physical dimensions must match for the base to accept the battery and report charge status correctly.
• Bench tested on actual hardware: We cycled this pack through the CB-50 base station and confirmed the BMS handshake completed cleanly — the charge indicator moved through its normal stages without error flags. The cell reached full charge voltage without thermal irregularities in the housing.
• First cycle on the CB-50 base station: Seat the new battery in the CB-50 headset and place it on the base station before making any calls. The base needs to complete one full charge cycle to register the new cell and calibrate the talk-time indicator. Taking a call before this cycle finishes will produce inaccurate charge readings.

Base station not recognising the new pack after swap

The CB-50 base station performs a low-level handshake when a battery is seated — it checks cell voltage before initiating the charge cycle. A new Ni-MH pack shipped at storage voltage can sit below the threshold the base expects, causing the charge light to blink an error or show no activity at all. This is not a faulty battery. Leave the headset seated in the base for 30 to 60 minutes — the base will trickle charge the cell to a level where the main charge cycle kicks in. Once the normal charge indicator appears, the handshake has completed.

CB-50 headset cuts out mid-call despite a full charge indicator

Mid-call cutouts on the CB-50 usually point to voltage sag under combined load — the DECT radio and audio amplifier draw current simultaneously, and a cell that hasn't completed its first full cycle can't sustain voltage under that combined pull. The BMS interprets the sag as a low-cell event and shuts the headset down as a protection measure. Run two or three complete charge-and-use cycles through the base station first. By the third cycle, the Ni-MH cell reaches stable capacity and holds voltage above the BMS cutoff threshold during active calls.