About this replacement
Somfy Oximo 40 RTS Series — 12V Ni-MH Replacement Battery (5122452B)
This is a 12V 3000mAh Ni-MH replacement battery for the Somfy Oximo 40 RTS motorized roller shade and awning actuator. It fits the Oximo 40 RTS 6 Nm, 6, 6/18, and 10 Nm variants. When the original cell degrades, the motor stops responding to RTS remote commands — this battery restores that function.
- Oximo 40 RTS actuator fit: The 6 Nm and 10 Nm variants share the same internal battery bay dimensions and 12V supply rail. The connector and cell form factor (428 x 25 x 22.3mm) match across this actuator family, so the same battery services the full range without modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Oximo 40 RTS platform. The BMS accepted the charge profile without fault, and the motor responded to RTS remote commands across all tested positions — up, down, and preset stop.
- First-run motor calibration: After fitting a new battery, run the shade through a full up-down travel cycle manually via the RTS remote. The Oximo actuator re-learns its travel limits from the new power state — skipping this step can leave the shade stopping short of its programmed end positions.
Why the Oximo 40 RTS stops responding mid-cycle after a battery swap
The Oximo 40 RTS motor controller monitors supply voltage throughout each travel cycle. If the replacement cell shipped in a low storage state, voltage can sag under motor load and trigger a mid-cycle cutoff — the shade stops and the remote appears to lose communication. This is not a pairing fault. Fully charge the new battery before the first run, then confirm resting voltage is at or above 13.2V before commanding a full-travel cycle.
RTS remote shows no response after battery replacement — not a pairing issue
After a power interruption, the Oximo 40 RTS controller resets its internal state. The motor needs up to 60 seconds after battery installation before it will accept RTS commands — sending commands immediately after fitting the cell gets ignored. Wait the full 60 seconds, then press the My button on the remote. If there is still no response, check that the battery connector is fully seated; a partial connection passes enough voltage to power the controller but not enough to drive the motor.