IBM 1700B Cordless Phone Replacement Battery 3.6V 600mAh

IBM 1700B / 3345 / 900MHZCID — 3.6V Ni-MH Replacement Battery

This 3.6V, 600mAh Ni-MH cell replaces the original rechargeable battery in IBM cordless phone handsets including the 1700B, 3345, and 900MHZCID. It fits directly into the battery compartment and connects to the handset's onboard charge circuit. Dimensions are 40.00 × 42.00 × 13.50mm — confirm against your original pack before ordering.

• 1700B, 3345, and 900MHZCID compatibility: These three IBM cordless handset models share the same 3.6V single-cell NiMH format, battery compartment footprint, and charge termination voltage. One cell fits all three without modification.
• Bench tested on actual hardware: We cycled this cell through the IBM handset charge circuit and confirmed the BMS accepted the charge without fault. Termination triggered correctly at full capacity — no error lights, no interrupted charge cycles.
• First-charge protocol for NiMH cordless handsets: Place the handset in the base immediately after installing this battery and leave it for a full 16 hours before first use. NiMH cells in cordless phones require a slow initial charge to reach rated capacity — skipping this shortens usable talk time from the first cycle.

Talk time shorter than original battery after replacement

NiMH cells ship in a partially discharged state and need three to five full charge-discharge cycles before reaching rated capacity. After the first charge, talk time will likely be noticeably shorter than expected — this is normal. Run the handset until it prompts you to charge, then return it to the base for a full charge each time. By cycle four or five, capacity stabilises at the rated 600mAh.

Base station showing no charge or error light on a new pack

NiMH batteries can drop below 3.0V during extended storage, which sits outside the acceptance threshold of some IBM base charge circuits. The base may show no charge indicator or an error light because its charge controller won't initiate on a deeply discharged cell. To recover, remove the battery, hold it at room temperature for 30 minutes, then reseat it firmly in the handset and return it to the base. If the base still won't initiate, use a compatible external NiMH charger to bring the cell above 3.2V first.