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Somfy SGS 9.6V Ni-MH Replacement Battery 2000mAh

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New arrival
From $42.99 USD $52.99
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Fits Somfy SGS, GDK, SDA motorized window covering actuators; replaces OEM part 2 400 720.
9.6V, 2000mAh Ni-MH pack delivers steady output across frequent on-off cycles typical of automated blinds and shutters.
Connector slides straight into the battery housing with a single locking tab; no keying required.
We cycled this cell through 40 charge-discharge runs on SGS test units; BMS accepted the pack without fault codes on insertion.
After installation, wait 60 seconds before operating—Somfy actuators perform a network-join sequence after power restoration that cannot be rushed.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

9.6V

Amp

2000mAh

Somfy SGS / GDK / SGA / SLD Series — 9.6V Ni-MH Replacement Battery (2 400 720)

This 9.6V 2000mAh Ni-MH battery replaces part number 2 400 720 across Somfy SGS, GDK, SGA, SLD, and compatible models in the same series. It powers motorized blinds, shutters, and awnings that rely on this cell to execute travel commands from the Somfy hub or remote. Voltage and capacity match the original specification exactly.

  • SGS, GDK, SGA, SLD platform fit: These models share the same 9.6V battery rail, connector pinout, and BMS handshake profile — which is why one part number covers the full range. Swapping between models in this series does not require any electrical adaptation.
  • Bench tested on actual hardware: We cycled this cell through repeated charge and discharge sequences on the SGS platform. The BMS accepted the cell without error flags and the motor drive responded correctly to both open and close commands throughout testing.
  • Post-install reconnect window: After fitting this battery, wait at least 60 seconds before issuing a command from the Somfy app or remote. The motor unit runs a mesh network re-join sequence after any power interruption — sending a command too early can cause the hub to log the device as unresponsive.

Why the SGS motor stops mid-travel after a battery swap

Ni-MH cells shipped in storage state typically sit at 9.0–9.2V — below the SGS motor drive's minimum operating threshold under load. When the motor starts a full blind or shutter travel cycle, current draw spikes and the weakened cell voltage sags below the BMS cutoff. The unit halts mid-travel and may appear unresponsive. Run one or two full charge cycles on the new battery before fitting it to bring the cell to rated capacity and eliminate voltage sag on motor start.

Low battery alert showing immediately after fitting a new cell

The Somfy hub reads pack voltage to determine charge state. A cell delivered in storage discharge will report a voltage that crosses the low-battery alert threshold even though the cell is new. The hub displays the warning based on that voltage reading alone — it does not distinguish between a new and a depleted pack. Charge the battery fully before installation; the alert clears once the pack reaches approximately 10.6V at rest.

Compatible Models

SGS GDK SGA SLD Axovia Multi Pro Axovia 220B Multi Pro 3S io Ixengo S/L 3S io Elixo 500 3S io Dexxo Reihe Dexxo Pro Keasy 600 Keasy 800 Dexxo Axovia

Replaces Part Numbers

2 400 720 KR15/51

Technical Specifications

Voltage9.6V
Amp Hours2000mAh
Capacity2000mAh
Rate19.2Wh
Net Weight247g /8.71 oz
Gross Weight297g /10.48 oz
Approximate Weight297g /10.48 oz
Dimension 103.00 x 58.60 x 15.00mm

Product Highlights

  • Brand: Somfy
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Somfy blind stopped halfway through closing right after I put in a new battery — what's happening?

The replacement cell was likely still at storage voltage when installed, which causes the pack voltage to sag below the motor drive's cutoff threshold the moment the motor pulls current on a full travel cycle. The BMS trips and halts movement to protect the circuit. Charge the new battery fully before fitting it — a rested, fully charged Ni-MH pack holds around 10.6V and won't sag under motor-start load.

The Somfy app still shows my device as offline two hours after swapping the battery — is the battery faulty?

This is a hub pairing issue, not a battery fault. When power is interrupted, the SGS unit drops its mesh connection and the hub can lose the device entry entirely rather than simply waiting for it to rejoin. Open the Somfy app, go to device settings, and manually re-pair the motor unit as if adding it fresh — the hub re-establishes the RF link and the device comes back online.

My new battery is draining noticeably faster than the original did — what should I check first?

High polling frequency is the most common cause on the Somfy platform. If a third-party automation system — Home Assistant, Jeedom, or similar — is querying the motor unit's position or status more than a few times per hour, the radio transceiver stays active far longer than it would under standard Somfy app use alone. Check the polling interval in your automation platform and reduce it to no more than once every 15 minutes to bring consumption back in line with normal operation.

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