Dualphone RTX3045 VOIP-Skype Replacement Battery 3.6V 700mAh

Dualphone RTX3045 VOIP-Skype — 3.6V Ni-MH Replacement Battery

This 3.6V, 700mAh Ni-MH cell replaces the original rechargeable pack inside the Dualphone RTX3045 VOIP-Skype cordless handset. It restores wireless operation for internet-based calls over Skype without replacing the whole handset. Capacity matches the original spec at 2.52Wh.

• RTX3045 handset fit: The RTX3045 VOIP-Skype uses a compact Ni-MH cell running a 3.6V rail to power both the DECT radio and the Skype client processor. The physical dimensions — 45.60 x 31.30 x 10.60mm — match the original battery bay, and the connector orientation aligns with the handset's PCB contacts without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the bench. The BMS accepted charge current from a standard Ni-MH base station, voltage rose cleanly to 4.2V at full charge, and the cell delivered consistent output across the discharge curve without early cutoff.
• First charge on Ni-MH cordless packs: After fitting, seat the handset in its base and leave it for a full 16 hours before first use. Ni-MH cells shipped in a partially discharged state need this slow initial charge to reach rated capacity — skipping it leaves the cell short of 700mAh from day one.

Base station charging error on a freshly installed Ni-MH pack

Ni-MH batteries lose voltage during storage. If the cell drops below roughly 3.0V, some base stations reject it — the charge indicator flashes an error or simply does nothing. The base expects a minimum open-circuit voltage before it starts its charge cycle. Placing the handset in the base for several minutes sometimes allows a trickle current to raise the voltage enough for the base to accept it. If the base still shows an error after 10 minutes, remove the handset, wait 30 seconds, and reseat it firmly.

Talk time shorter than the original battery after replacement

A new Ni-MH cell does not deliver full rated capacity on the first cycle — this is normal chemistry, not a fault. Capacity builds over three to five full charge-discharge cycles as the cell's crystalline structure stabilises. Run the handset down to the low-battery warning, then charge it fully in the base each time. By cycle five, the cell should be delivering at or near its rated 700mAh.