Siemens Gigaset E40 Replacement Battery 2.4V 500mAh Ni-MH

Siemens Gigaset E40 / E45 / E450 Series — 2.4V Ni-MH Replacement Battery (V30145-K1310-X382)

This is a 2.4V, 500mAh Ni-MH battery pack for the Siemens Gigaset E40, E45, E450, and E450 ECO cordless DECT handsets. It slots into the handset battery compartment and restores wireless operation when the original cell has lost capacity or stopped holding a charge. Voltage and cell format match the OEM specification exactly.

• Gigaset E40 / E45 / E450 platform fit: These handsets share the same battery bay dimensions (35.60 × 31.80 × 6.60mm), 2.4V two-cell NiMH configuration, and charging contact layout — so one battery cell serves the full range without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a Gigaset base station. The BMS accepted the cell without error, charge termination triggered correctly at full voltage, and the handset registered a full charge indicator on the display.
• First-charge protocol for NiMH cordless packs: Place the handset in the base immediately after fitting and leave it for a full 16 hours before first use. NiMH cells shipped in storage state do not reach rated capacity on a short top-up charge — the slow first charge is what conditions the cell to its full 500mAh.

Why the Gigaset E450 base station shows a charging error on a new NiMH pack

The Gigaset base station uses a delta-V detection circuit to confirm that a NiMH cell is accepting charge. A battery shipped in deep storage can sit below 2.0V total, which some base stations interpret as a fault rather than a dischargeable cell. The fix is to place the handset in the base and leave it — the trickle pre-charge stage will bring the cell voltage up to the acceptance threshold within 30 to 60 minutes, after which normal fast charge begins and the error light clears.

Talk time shorter than the original battery after fitting a new cell

NiMH cells do not deliver full rated capacity from cycle one — this is normal chemistry behaviour, not a fault with the replacement. The cell needs three to five full charge-discharge cycles before the crystalline structure in the electrodes stabilises and the cell reaches its rated 500mAh. Each full cycle closes the gap. To run a proper conditioning cycle, use the handset until the low-battery indicator appears, then return it to the base for a full uninterrupted charge before using it again.