Telekom Sinus A201 Replacement Battery 2.4V 600mAh

Telekom Sinus A201 — 2.4V Ni-MH Replacement Battery

This 2.4V, 600mAh Ni-MH pack replaces the original handset battery in the Telekom Sinus A201 cordless phone. It restores talk time and standby function when the factory cell has degraded and no longer holds a charge. Voltage and cell chemistry match the original spec exactly.

• Sinus A201 handset fit: The Sinus A201 uses a compact two-cell Ni-MH configuration at 2.4V. This pack matches that cell count, connector orientation, and physical footprint — 35.40 x 32.50 x 6.70mm — so it seats correctly in the handset battery compartment.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Ni-MH test rig. The BMS accepted charge from a standard DECT base station without fault, and the cell voltage held stable through the full discharge curve without early cutoff.
• First-charge conditioning on DECT base stations: After installing this pack, place the Sinus A201 handset in the base cradle and leave it for a full 16 hours before use. Ni-MH cells shipped in storage state sit below peak capacity — a slow first charge through the base lets them reach rated 600mAh before you start cycling them.

Talk time shorter than the original battery after replacement

New Ni-MH cells do not deliver full capacity on the first charge cycle. The Sinus A201 base station charges at a trickle rate, so capacity builds across the first three to five full charge-discharge cycles. Pulling the handset off the base after a few hours and using it heavily before the cells have conditioned will produce short talk time. Run three complete cycles — full charge, full use until low battery, then full recharge — and capacity will climb to the rated 600mAh.

Base station charge indicator not lighting after fitting new pack

Ni-MH packs stored for extended periods can drop to a voltage the Sinus A201 base station reads as a fault rather than a dischargeable cell. The base station's charge circuit expects to see a minimum terminal voltage before it enables the charge rail. If the indicator stays off or shows an error after you seat the handset, remove the handset, wait ten seconds, and reseat it firmly — this resets the charge detection cycle. If the indicator still does not light, check that the handset is fully seated and the base contacts are clean; the charge circuit re-polls at seating and should begin charging once terminal voltage is above approximately 1.8V total.