About this replacement
Siemens Gigaset SL910 Series — 3.7V Li-ion Replacement Battery (V30145-K1310K-X447)
This is a 3.7V 1050mAh Li-ion battery for the Siemens Gigaset SL910, SL910H, and SL910A cordless DECT handsets. It replaces OEM part numbers V30145-K1310K-X447, V30145-K1310K-X447-0-HY, and V30145-K1310-X447. Swap it in when the original battery no longer holds a charge or the handset fails to power on.
- SL910, SL910H, and SL910A compatibility: All three handset variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell fits all three without modification.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on the SL910 platform. The BMS accepted the cell without a fault code, and the handset reported full charge correctly on the base station display.
- First-charge protocol for DECT Li-ion handsets: After installing, seat the handset in the base and leave it for a full charge cycle before first use. The SL910 base charges at a low trickle rate — removing the handset early will leave the cell below rated capacity and the handset will report low battery sooner than expected.
Talk time shorter than rated after battery swap on the SL910
A new Li-ion cell ships partially discharged and needs at least one full charge cycle on the SL910 base before capacity stabilises. The base station charges at a controlled low current — this is normal, not a fault. If talk time still feels short after two or three full cycles, check that the handset sits flush in the cradle and the charging contacts are clean. A thin layer of oxidation on the contacts can reduce charge current enough to leave the cell underfilled.
Base station not showing charge after installing the new battery
The SL910 base checks the battery voltage before initiating a charge cycle. A cell that has discharged below approximately 3.0V during storage may fall outside the base's acceptance window, and the charge indicator will not light. Remove the handset, wait 30 seconds, and re-seat it firmly — this resets the base's detection circuit. If the indicator still does not light, use a separate Li-ion charger to bring the cell above 3.2V, then return it to the base.