About this replacement
Siemens G95X / Gigaset 825 / Gigaset 905 — 4.8V Ni-MH Replacement Battery (V30145K1310X50)
This 4.8V, 700mAh Ni-MH battery replaces the original pack in the Siemens G95X, Gigaset 825, and Gigaset 905 cordless DECT handsets. It matches the OEM voltage and cell configuration required by the handset's charging circuit. Dimensions are 42.61 × 40.93 × 10.25mm — the same footprint as the factory battery.
- G95X, Gigaset 825, and Gigaset 905 compatibility: All three handsets share the same 4.8V three-cell Ni-MH architecture and battery bay dimensions. The connector orientation and charge termination voltage are identical across the range, so one pack covers all three models.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on a Gigaset handset. The base station accepted the battery without error, the charge indicator activated normally, and the BMS held voltage within the expected 4.8V nominal range across all test cycles.
- First-charge protocol for Ni-MH handset batteries: Seat the handset in the base for a full 16-hour charge before first use. Ni-MH cells shipped in a partially discharged state will not reach rated capacity on a standard top-up charge. Skipping this step is the most common reason a new battery underperforms from day one.
Base station showing no charge light on a new Ni-MH pack
Ni-MH batteries lose charge during storage. If the cell voltage drops low enough, the Gigaset base station's charge controller may not recognise the pack as a valid battery and will withhold current entirely. This is a voltage threshold issue, not a fault with the handset or the replacement battery. In most cases, leaving the handset seated in the base for 30–60 minutes allows a trickle of current to raise cell voltage above the acceptance threshold, after which the full charge cycle begins. If the charge light still does not activate, remove the handset, wait 10 seconds, and reseat it firmly — poor contact at the charging pins is a separate but equally common cause.
Talk time shorter than expected after the first few charges
Ni-MH cells require three to five full charge and discharge cycles before they reach rated capacity. A battery that feels weak in the first week is almost always still conditioning, not defective. Avoid interrupting charges during this period — partial cycles slow the conditioning process. By cycle five, capacity should stabilise at or near the rated 700mAh; if it does not, check that the handset charges at 4.8V across the battery terminals with a multimeter.