Velux 946933 Rollladen Antrieb Replacement Battery 10.8V 2000mAh

Velux Rollladen Antrieb — 10.8V Ni-MH Replacement Battery (946933)

This is a 10.8V, 2000mAh Ni-MH replacement battery for Velux motorized roller shutter and blind drives. It fits the Rollladen Antrieb, Solar Rollladen, SSL Solar Rollladen, and SSL Solar Rollladen Motor mit Stecker systems. When the existing cell loses capacity, the shutter motor becomes sluggish or stops responding entirely — this battery restores full drive function.

• Rollladen Antrieb and SSL Solar motor compatibility: These models share the same 10.8V NiMH cell format, connector pinout, and BMS handshake protocol. Swapping to a fresh 2000mAh cell gives the drive motor the current headroom it needs during start-up and full travel.
• Bench tested on actual hardware: We ran this cell through full open-close cycles on a Rollladen Antrieb drive. The BMS accepted the charge handshake cleanly, and voltage held steady across the motor start surge without triggering a protective cutoff.
• Motor stall prevention after install: After fitting the new battery, run one full manual open-close cycle using the Velux remote before setting any automation schedules. This lets the drive controller recalibrate travel limits against the restored voltage baseline and prevents mid-travel stalls.

Why the Velux shutter drive stops mid-travel on a partially discharged cell

Ni-MH cells lose voltage sharply once capacity drops below roughly 30%. The Rollladen Antrieb motor draws peak current at the start of travel and again when the shutter hits mechanical resistance near the end stop. A weak cell sags below the motor controller's minimum operating voltage at exactly these moments, triggering a cutoff and leaving the shutter frozen mid-run. A fresh 2000mAh cell at full charge holds above 10.8V through both load spikes.

Velux app shows shutter offline immediately after battery swap

Cutting power to the drive unit drops it off the Velux Active or io-homecontrol mesh network. After inserting the new battery, the motor controller runs a network re-join sequence that takes up to 60 seconds. Do not attempt to trigger the shutter or send commands from the app during this window. If the device still shows offline after 90 seconds, press the programming button on the drive unit once — this forces a fresh mesh re-join without clearing your existing pairing.