Telekom Compact 3.6V Ni-MH Replacement Battery NS3109

Telekom Compact / T-Sinus 45 Micro Series — 3.6V Ni-MH Replacement Battery (NS3109)

This is a 3.6V 500mAh Ni-MH replacement battery for Telekom cordless handsets. It fits the Compact, T-Sinus 45 Microserie, and T-Sinus 45 Micro models. Physical dimensions are 47.36 x 34.20 x 7.49mm — confirm these match your current cell before ordering.

• Compact and T-Sinus 45 Micro compatibility: These handsets share the same 3.6V single-cell NiMH voltage rail, connector layout, and physical bay dimensions. One cell fits all three models listed above.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a cordless phone handset platform. The NiMH chemistry accepted a slow 16-hour trickle charge without thermal event, and the protection circuit responded correctly to end-of-charge detection from the base station.
• First charge on Telekom NiMH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells shipped from storage are partially discharged — a slow first charge lets the cell reach its rated 500mAh capacity. Skipping this step will make talk time noticeably shorter from day one.

Base station showing no charge light after fitting a new NiMH cell

NiMH cells can drop to a very low voltage during storage — sometimes below 1.0V per cell. Some Telekom base stations will not begin charging if the pack voltage falls below their acceptance threshold at the charge contacts. The base reads no valid battery and refuses to start the charge cycle. Place the handset in the base, leave it undisturbed for 30 minutes, then check again — most bases will recover the cell once contact voltage climbs above roughly 1.1V per cell.

Talk time still short after three or four days of use

NiMH cells need three to five full charge-discharge cycles before they reach rated capacity — this is normal behaviour, not a fault. On the first few cycles the cell delivers noticeably less capacity than the 500mAh rating. Run the handset down until it signals low battery, then return it to the base for a full charge each time. By the fifth cycle, capacity typically stabilises at or close to the rated figure.