Telekom NS-3098 Cordless Phone Replacement Battery 2.4V 700mAh

Telekom Italy Citytel Pocket — 2.4V Ni-MH Replacement Battery (NS-3098)

This is a 2.4V, 700mAh Ni-MH replacement battery for the Telekom Italy Citytel Pocket cordless DECT handset. It also fits the Italy City Tel Pocket, Italy City 2000, and Sinus CM 800. OEM part numbers NS-3098 and BC101590 both cross-reference to this cell pack.

• Citytel Pocket and Sinus CM 800 platform: These handsets share the same 2.4V NiMH cell format, connector pinout, and base-station charge circuit. One cell pack covers the full compatibility range listed above without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a 2.4V NiMH test rig. The BMS accepted charge without thermal spike, and cell voltage held stable through discharge down to the 1.0V per-cell cutoff floor.
• First-charge protocol for NiMH cordless handsets: After installing, seat the handset in the base and leave it for a full 16 hours before the first call. NiMH cells in cordless phones need this slow initial charge to reach rated capacity — a short first charge locks in a lower ceiling permanently.

Base station charging error on a new NiMH pack

Replacement NiMH batteries ship in a partially discharged state, sometimes below 2.0V total. Some Telekom base stations use a voltage-detection handshake before committing charge current — if the pack sits too low, the base reads it as a fault and shows an error light instead of charging. The fix is to insert the handset, leave it undisturbed for 30 minutes, then remove and re-seat it. This gives the base time to trickle enough current to lift the pack above the acceptance threshold, typically around 2.2V.

Range drops noticeably when the NiMH pack is below half charge

DECT transmit power on the Citytel Pocket is drawn directly from the cell pack voltage rail. As a NiMH cell discharges toward its lower voltage curve, the RF transmit stage cannot sustain full output power — range shrinks as voltage sags. This is more pronounced with a new or reconditioned pack because NiMH cells don't reach peak voltage stability until three to five full charge-discharge cycles are complete. Keeping the handset docked between calls during the first week resolves this quickly.