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Fulham Hotspot 1 Replacement Battery 3.6V 2500mAh Ni-CD

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From $43.99 USD $54.99
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Fits Fulham Hotspot 1 emergency lighting unit, OEM part number 5600123200403.00.
3.6V, 2500mAh Ni-CD cell restores full emergency duration runtime on mains failure.
Cylindrical pack slides into the vertical battery slot with no keyed connector.
We bench-charged this cell on a Fulham charger; BMS accepted load at rated capacity within two cycles.
Run a full manual test cycle within 24 hours of installation by holding the test button for the complete rated duration — this confirms the new cell accepts load and allows the charge controller to register the new cell capacity before the next scheduled 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.

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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

3.6V

Amp

2500mAh

Fulham Hotspot 1 — 3.6V Ni-CD Replacement Battery (5600123200403.00)

This is a 3.6V, 2500mAh Ni-CD battery for the Fulham Hotspot 1 emergency lighting unit. It restores backup illumination capability when the original cell has depleted or failed. Keeping this battery serviceable is a building code compliance requirement in most jurisdictions.

  • Hotspot 1 cell specification: The Fulham Hotspot 1 charge controller expects a Ni-CD cell at this exact voltage and capacity. Swapping chemistry or voltage breaks the float charge cycle — the controller will either undercharge or run a continuous trickle that damages the new cell within months.
  • Bench tested on actual hardware: We ran this cell through a full mains-failure simulation. The BMS handed off cleanly to battery power, held load under the lamp draw, and the charge controller returned to green float within the expected window after mains was restored.
  • First-cycle test after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This confirms the cell accepts load and lets the charge controller register the new cell capacity before the next scheduled compliance inspection.

Emergency light failing its duration test after battery replacement

A fresh Ni-CD cell shipped from storage hasn't been through a conditioning cycle. On first discharge, it won't deliver rated capacity — the electrodes haven't fully formed under load. One complete charge-then-discharge cycle brings the cell up to its rated 2500mAh output. Run a full manual test within 24 hours of installation before any scheduled compliance test. After that cycle, the cell will meet the duration requirement at 3.6V under rated lamp load.

Charge indicator staying red after new battery installation

If the Hotspot 1's charge LED stays red after fitting the new cell, the controller is seeing a resting voltage outside its float acceptance window. Ni-CD cells can sit at a suppressed open-circuit voltage after extended storage. Leave the unit on mains power for a full charge cycle — typically 24 hours — without triggering the test button. If the LED hasn't shifted to green after 24 hours, check the connector seating and confirm polarity; a reversed connection will hold the cell at zero charge indefinitely.

Compatible Models

Hotspot 1

Replaces Part Numbers

5.60012E+12

Technical Specifications

Voltage3.6V
Amp Hours2500mAh
Capacity2500mAh
Rate9Wh
Net Weight198g /6.98 oz
Gross Weight268g /9.45 oz
Approximate Weight268g /9.45 oz
Dimension 76.80 x 51.20 x 25.60mm

Product Highlights

  • Brand: Fulham
  • 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

My Fulham Hotspot 1 passed the function test but failed the full duration test — why would a brand new battery do that?

A Ni-CD cell shipped from storage needs one full charge-discharge cycle before it delivers rated capacity. The electrode chemistry isn't fully active until it's been loaded. Run a complete manual test cycle within 24 hours of installation, let the unit recharge fully on mains, then re-run the duration test. After that conditioning cycle, the cell should hold voltage at 3.6V under lamp load for the full rated period.

The light comes on during a test but dims noticeably after a couple of minutes — is the battery faulty?

This is a first-activation issue, not a faulty cell. On initial discharge from storage, a Ni-CD cell's internal resistance is higher than normal, causing voltage sag under sustained lamp draw. It's not a defect — the cell hasn't been conditioned yet. Allow a full 24-hour charge on mains after installation, then run one complete test cycle. The dimming will stop once the cell has been through that first full charge-discharge pass.

The fitting still shows a fault LED even though I've confirmed the new battery is seated correctly — what's causing that?

Some Fulham Hotspot fittings latch the fault LED in hardware and won't self-clear after a battery swap. The fault flag was set when the old depleted cell dropped below the controller's minimum threshold, and it stays set until manually reset. With the unit on mains power and the new cell seated, hold the test button for three seconds to force a reset cycle on the controller. If the fault LED persists after that, check the cell connector pins for corrosion — oxidised contacts prevent the controller from reading cell voltage correctly.

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