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Legrand 61799 8.4V Emergency Light Compatible Battery 805806

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From $78.99 USD $97.99
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Fits Legrand 61799 emergency lighting units, replaces OEM part 805806 and H95473.
8.4V, 2000mAh nickel-cadmium cell delivers 16.8Wh — sufficient for full emergency exit illumination during mains power loss.
Connector slides into the vertical slot with locking tab engagement; confirm orientation before seating to avoid contact damage.
Bench testing shows the BMS charges to float within 24 hours; initial activation may dim slightly until full charge acceptance completes.
Run a manual test cycle within 24 hours of installation by holding the test button for the full rated duration — this confirms the new cell accepts load and registers capacity before the next compliance test.
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.

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⚠️ 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

8.4V

Amp

2000mAh

Legrand 61799 / G5 Series — 8.4V Ni-CD Replacement Battery (805806)

This is an 8.4V, 2000mAh nickel-cadmium battery for Legrand emergency lighting units, including the 61799, 061799, and G5 series fittings. It replaces OEM part numbers 805806 and H95473. The cell restores backup illumination capability when the original battery can no longer sustain the fitting through a full duration test.

  • 61799, 061799 and G5 fitting compatibility: These fittings share the same 8.4V charge rail, cell geometry at 294.70 × 23.00 × 23.00mm, and trickle-charge controller. The BMS handshake on each accepts Ni-CD cells within the standard float voltage window, so no firmware changes are needed.
  • Bench tested on actual hardware: We cycled this cell through a simulated mains-failure event, confirmed the fitting switched to battery within the required time, and verified the charge controller returned to green float status after a full recharge cycle.
  • First test-cycle conditioning: Run the manual test button for the full rated duration within 24 hours of installation. This allows the charge controller to register the new cell capacity and ensures the fitting records a valid result before your next scheduled compliance inspection.

Charge indicator staying red after new battery installation

Ni-CD cells can sit in storage for months before reaching the end user, which drops their resting voltage below the charge controller's float acceptance window. When the controller sees a voltage outside that range, it holds the fault or charging state rather than switching to green. Leave the fitting connected to mains for a full 24-hour charge cycle before expecting the indicator to change. If the LED is still red after 24 hours, check terminal contact and confirm cell voltage at the connector reads above 7.2V.

Emergency light dims and cuts short during a duration test

A new cell that has not yet completed one full charge-discharge cycle will not deliver its rated 2000mAh on first draw. The fitting dims or shuts off early because the cell voltage sags under load before the full test period ends. This is not a faulty cell — it is an uncharged one. Charge for a minimum of 24 hours, then run the full manual test; the cell should hold voltage across the entire duration at that point.

Compatible Models

61799 061799 G5

Replaces Part Numbers

805806 H95473

Technical Specifications

Voltage8.4V
Amp Hours2000mAh
Capacity2000mAh
Rate16.8Wh
Net Weight333g /11.75 oz
Gross Weight603g /21.27 oz
Approximate Weight603g /21.27 oz
Dimension 294.70 x 23.00 x 23.00mm

Product Highlights

  • Brand: Legrand
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Ni-CD
  • Battery Type: Ni-CD
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The fault LED on my Legrand 61799 fitting is still showing after I've fitted the new battery and confirmed the connections are solid — what's causing it?

Some Legrand fittings latch a fault condition in the controller and do not clear it automatically when a new cell is detected. The fitting needs a manual reset: disconnect mains power, wait 30 seconds, then reconnect. If the LED still shows a fault after a full 24-hour charge, check that the cell resting voltage at the terminals reads at least 7.2V — anything below that and the controller will refuse to exit fault state.

My emergency light passed the previous annual test but failed this year's duration test within a few minutes of the mains being cut — the battery is less than two years old, what's happening?

Continuous trickle charging at the temperatures inside a ceiling or bulkhead fitting accelerates Ni-CD capacity fade significantly. A cell that measures 8.4V on float can still have lost 40–50% of usable capacity to this degradation, which only shows up under sustained load. The cell will not recover — replace it and run a full 24-hour charge before the next compliance test. Going forward, log the fitting location: fittings above heat sources or in plant rooms degrade cells faster and need shorter replacement intervals.

After replacing the battery, the new cell feels warm to the touch and the fitting never switches to a green charge indicator — is the charge controller overcharging it?

Warmth during the initial charge of a discharged Ni-CD cell is normal, but if the cell stays hot to the touch after 48 hours and the indicator never reaches green, the charge controller is likely applying continuous trickle charge without detecting the end-of-charge voltage rise. This can happen if the original cell failed due to a short-circuit condition that damaged the controller's sensing circuit. Confirm the cell voltage at the connector — it should stabilise between 8.4V and 9.0V on full charge. If it reads above 9.5V, the controller needs replacing, not the battery.

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