About this replacement
Bosch D14 / K Series — 6V Ni-MH Replacement Battery (9018912)
This is a 6V 2000mAh Ni-MH replacement battery for Bosch smart home devices. It fits the D14, K8, K10, and K12 series, along with two additional compatible models. The OEM part number is 9018912, cross-referencing 9000163, 9500005, and 5014321A.
- D14 and K-series platform compatibility: These Bosch models share the same 6V power rail, physical form factor, and BMS handshake protocol. One cell covers the full range — no adapter or firmware adjustment needed.
- Bench tested on actual hardware: We ran this battery through charge and discharge cycles on a D14 unit. The BMS accepted the cell without fault codes, and voltage held steady across the full discharge curve without premature cutoff.
- Post-install reconnection window: After installing, allow 60 seconds before expecting the device to reconnect. Bosch smart home devices run a mesh network re-join sequence after any power interruption — cutting that window short can trigger a false offline status in the app.
Why the D14 drains faster after a battery swap
A Ni-MH cell stored for several months arrives at a suppressed voltage — typically below the device's normal operating range. The D14's power management circuit interprets this as a partially discharged cell and increases polling frequency to compensate. That behaviour pushes drain up sharply in the first 24–48 hours. Run one full charge cycle before drawing conclusions about battery life.
Low battery alert showing immediately after fitting a new cell
This happens when the cell's resting voltage at delivery is below the alert threshold the hub monitors — common with Ni-MH after extended shelf storage. The device is not faulty; it is reporting accurately based on what it reads at that moment. Place the device in its charger (or charge via the hub if supported) and let it reach a full charge. The alert clears once the cell voltage rises above approximately 6.8V under light load.