Short answer: The Somfy Irismo 45 replacement battery is part 9026476, a 25.9V rechargeable Li-ion pack. Somfy lists one motor for it, the Irismo 45 WireFree RTS drapery motor (1002353). The pack twists onto the bottom of the motor and clicks into place. Recharge it with the Somfy Irismo 45 charger (1003080), the only charger Somfy names for this motor.
Confirm the motor before you order the pack
The Somfy Replacement 25.9V Rechargeable Li-ion Battery for Irismo 45 WireFree RTS (9026476) fits one Somfy drapery motor. Somfy's product page for the battery lists a single compatible product, the Somfy Irismo 45 WireFree RTS Drapery Motor (1002353). If the drapery motor on your track carries that reference, this pack is the match.
Check the label on the motor head. An Irismo 45 WireFree has no power cord running to the wall, and the battery pack sits on the bottom end of the motor body. A drapery motor with a cord and plug runs on mains or low-voltage power and takes no battery at all. Somfy's other rechargeable packs, such as the Rechargeable Lithium-ion Battery Pack (9021217), belong to the roller shade WireFree families and carry a different voltage. Match the pack to the motor reference on the label, not to the voltage printed on another pack.
Draperies the Irismo 45 WireFree can carry
Somfy built the Irismo 45 WireFree RTS for draperies that hang where an outlet above the window would be hard to add. Somfy's Drapery Databook lists one-way, center opening and asymmetric draws, plus pinch pleat, RippleFold and Accordia headings. The motor drives a belt inside the track, and Somfy lists a top mount kit among its accessories.
The battery has to carry a real load. Somfy rates the motor for 99 lb (45 kg) of fabric on a side or center opening track and 198 lb (90 kg) when two motors run in tandem. Track length goes up to 33 ft (10 m). Somfy publishes an adjustable speed of 4.9 to 7.86 in per second and a 45 W rated power. Between moves the motor draws less than 0.006 W, so the 3200 mAh pack spends its charge on travel rather than standby.
Irismo 45 battery specifications from Somfy
The figures below come from Somfy's pages for ref 9026476 on somfypro.com and somfysystems.com, plus the Irismo 45 WireFree RTS spec sheet and Drapery Databook for the motor side.
| Somfy reference | 9026476 |
| Chemistry | Rechargeable Li-ion |
| Battery voltage | 25.9 V |
| Capacity (motor spec sheet) | 3200 mAh |
| Weight | 1.26 lb |
| Size (L x W x H) | 3.74 x 2.09 x 5.55 in |
| Working temperature | 32 F to 140 F |
| Storage temperature | 32 F to 95 F |
| Compatible motor | Irismo 45 WireFree RTS (1002353) |
| Matching charger | Irismo 45 charger (1003080) |
| Warranty | 5 years |
Pay attention to the storage ceiling. Somfy allows the pack to work up to 140 F but store only up to 95 F. A spare battery left in a hot garage or a work van in July sits outside that window. Keep spares indoors at room temperature.
Charging with the Somfy 1003080 charger
Somfy's Irismo WireFree instructions tell you to use only the Somfy power charger with this motor. That charger is the Somfy Irismo 45 RTS Motor Battery Charger (1003080). Somfy's Drapery Databook describes it as a plug-in charger with a 5 ft cable, and Somfy's product page lists a 90 to 240V, 50 to 60Hz AC input with cTUVus approval.
Somfy's instructions give the charge sequence in three steps:
- Connect the charger to the bottom of the battery pack, or to the top of the pack if it is off the motor.
- The charger LED turns red while the pack charges.
- The LED turns green when the charge cycle is complete. Disconnect the charger and store it.
The motor will not run while the charger is connected, so plan the charge for a time the room can live with the drapery parked. Somfy recommends charging between 32 F and 104 F (0 C to 40 C). Somfy also tells you not to charge while maintenance work such as window cleaning goes on nearby.
Fitting the replacement pack
Somfy designed the battery as a replaceable part, and its instructions describe the fit in two moves. Connect the battery pack to the bottom of the motor, then twist the pack until it clicks into the locked position. Charge the new pack fully with the 1003080 charger before you put the drapery back in service.
The motor reports its battery state with a beep and its LED. Somfy's instructions list four signals:
- Charged: one beep, and the green LED blinks for several seconds. The motor is ready.
- Weak: one beep, and the red LED blinks for several seconds. Charge the pack.
- Low battery during use: the motor beeps once before it runs and once after it stops.
- No battery: one beep and a fast red blink.
If a full charge no longer carries the drapery through its normal routine, 9026476 is the swap. Somfy's safety notes apply to the new pack and the old one. Do not open or modify it, keep it away from heat above 104 F, fire and liquids, and protect it from drops. Use only Somfy-qualified replacement parts, and recycle the spent pack under your local battery rules. The full instruction set for the motor sits in our Somfy spec sheet library, and your motor's own guide governs if its revision differs.
Controls that pair with the Irismo 45 WireFree
Somfy lists the Irismo 45 WireFree on 433.420 MHz with 12 channels and a 656.2 ft open-field range. Somfy RTS transmitters drive it. The Somfy Situo 5 Channel RTS Pure Remote (1870575) handles a drapery plus four more shades or groups from one handset.
For app control, schedules and voice assistants, Somfy names the Somfy TaHoma Switch RTS and Zigbee Smart Hub (1871037) as the compatible hub. Our Irismo 45 WireFree motor guide covers track sizing and setup, and the WireFree batteries and chargers guide sorts out which pack fits which Somfy motor.
Keep a charged spare on hand if the drapery covers a bedroom or a media room. Swapping packs takes a twist, and the room goes dark on schedule while the other pack charges. You will find the pack, the charger and the rest of Somfy's power parts in our Somfy batteries and chargers collection.
Sources: somfypro.com and somfysystems.com product pages for refs 9026476, 1002353 and 1003080; Somfy Irismo 45 WireFree RTS Spec Sheet (2026.06.12); Somfy Drapery Databook (2026.08.04); Somfy Irismo WireFree installation instructions.
Frequently asked questions
Which battery does the Somfy Irismo 45 WireFree use?
The Irismo 45 WireFree RTS (1002353) uses Somfy's 25.9V rechargeable Li-ion pack, part 9026476. Somfy's motor spec sheet lists a 3200 mAh capacity. Somfy includes a pack with the motor, and 9026476 is the genuine replacement when that pack no longer holds a charge. Somfy lists no other motor for this battery, so order it by the 1002353 reference.
Can I charge the Irismo 45 battery with another Somfy charger?
Somfy's instructions say to use only the Somfy power charger with this motor, and Somfy names the Irismo 45 charger (1003080) for it. That charger takes 90 to 240V AC and carries cTUVus approval. Connect it to the bottom of the pack on the motor. The LED shows red while charging and turns green when the cycle is complete.
Does the Irismo 45 work while the battery charges?
No. Somfy's instructions state that the motor cannot be used while charging. Plan the charge for a time when the drapery can stay parked, such as overnight or while you are out. A charged spare pack avoids the downtime, since you twist the spare on and charge the old pack separately with the 1003080 charger.
How do I know the Irismo 45 battery needs charging?
The motor tells you with a beep and its LED. A weak pack gives one beep and a red LED blink for several seconds. During use, a low pack makes the motor beep once before it runs and once after it stops. A charged pack gives one beep and a green blink. A fast red blink means the motor reads no battery.
Shade Motors Direct is an authorized source for genuine Somfy motorized window shade, blind, and drapery parts.
