About this replacement
Roma Rollladen Rolladen — 12V Ni-MH Replacement Battery (PA000678)
This is a 12V 2000mAh Ni-MH replacement battery for the Roma Rollladen Rolladen motorised roller shutter system. It powers the smart home automation motor that drives automatic opening and closing of the blind. Capacity is 2000mAh (24Wh), matching the original specification.
- Roma Rollladen Rolladen compatibility: The OEM part number PA000678 ties this cell to the Rollladen Rolladen motor controller. The 12V Ni-MH chemistry matches the voltage rail and charge termination logic the motor BMS expects. Swapping to a different chemistry would cause incorrect charge cutoff and possible controller fault.
- Bench tested on actual hardware: We cycled this battery through a full charge and discharge sequence, confirming the BMS accepted the cell without fault flags. Charge termination triggered correctly at peak voltage, and the motor responded to open and close commands without hesitation.
- Post-install network re-join: After fitting this battery, wait at least 60 seconds before expecting the roller shutter to respond to hub commands. The motor controller runs a mesh network re-join sequence after any power interruption. Triggering a command too early can cause a missed event log and confuse the automation routine.
Why the Rollladen motor stops responding mid-automation after a battery swap
Ni-MH cells fresh from storage often sit below the controller's minimum operating voltage threshold, typically around 10.8V for a 12V pack. The motor may start a scheduled move and cut out halfway through when the controller detects a voltage dip under load. This is not a fault with the battery — it is the BMS protecting the controller from a low-state-of-charge cell. Run one full charge cycle before placing the battery into automated service to bring it up to a stable resting voltage above 12V.
Low battery alert appearing immediately after fitting a new PA000678 cell
Smart home hubs read battery state from the last reported voltage, not from physical detection of a new cell. If the replacement battery was stored for several months, its resting voltage may be below the alert threshold — commonly 11.4V for this pack. The hub sees that voltage and fires the alert before any charge has happened. Charge the battery fully first, then re-seat it. The alert should clear once the hub polls and reads a voltage above 12V.