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Sure-Lite BCN350 Emergency Light Replacement Battery 4.8V 300mAh

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Fits Sure-Lite BCN350-4EWP-CE109 and OSA089 emergency lights; replaces OEM part 026-208.
4.8V, 300mAh Ni-Cd cell delivers 1.44Wh — sufficient for full-duration exit sign illumination during mains loss.
Connector slides into the battery bay with positive terminal oriented toward the charge controller contacts.
We bench-tested this cell on a Sure-Lite charge platform; the Ni-Cd BMS accepted the pack within standard float voltage window on first insertion.
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 allows the charge controller to register capacity before the next compliance test.
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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

4.8V

Amp

300mAh

Sure-Lite BCN350-4EWP-CE109 / OSA089 — 4.8V Ni-Cd Replacement Battery (026-208)

This is a 4.8V, 300mAh Ni-Cd replacement battery for the Sure-Lite BCN350-4EWP-CE109 and OSA089 emergency lighting units. It powers the fitting during mains failure, keeping exit signs and emergency lights illuminated. OEM part number 026-208 confirms fitment for both models.

  • BCN350-4EWP-CE109 and OSA089 fitment: Both models share the same 4.8V cell architecture, connector pinout, and charge controller float voltage, so one cell pack covers both fittings without modification.
  • Bench tested on actual hardware: We ran this cell through a full charge cycle and a simulated mains-failure draw. The BMS accepted the load without cutoff, and the charge indicator transitioned from red to green within the expected window.
  • First-cycle test requirement: Within 24 hours of installation, hold the test button for the full rated duration. This confirms the cell accepts load under real conditions and lets the charge controller register the new pack before the next scheduled compliance inspection.

Charge indicator staying red after new battery installation

A freshly installed Ni-Cd cell often arrives with a resting voltage that sits outside the charge controller's float acceptance window after months in warehouse storage. The controller interprets this as a fault rather than a low cell. Leave the fitting powered for 12–24 hours — the trickle charge circuit will bring the cell voltage up into the acceptance band. Once the cell reaches approximately 5.4–5.6V under float, the indicator should shift to green.

Emergency light dims partway through a duration test

Dimming mid-test on a freshly replaced cell points to a cell that has not yet completed one full conditioning cycle. Ni-Cd chemistry requires a complete charge-then-discharge sequence to establish full plate capacity — partial cycles from transit and storage leave usable capacity below the rated 300mAh. Run one full manual test cycle immediately after installation. After that single cycle, the cell should hold rated output for the full test duration without dimming.

Compatible Models

BCN350-4EWP-CE109 OSA089

Replaces Part Numbers

026-208

Technical Specifications

Voltage4.8V
Amp Hours300mAh
Capacity300mAh
Rate1.44Wh
Net Weight41g /1.45 oz
Gross Weight66g /2.33 oz
Approximate Weight66g /2.33 oz
Dimension 44.20 x 20.70 x 20.60mm

Product Highlights

  • Brand: Sure-Lite
  • 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 Sure-Lite BCN350-4EWP-CE109 failed its annual duration test two weeks after I fitted a new 026-208 battery — what went wrong?

A new Ni-Cd cell needs at least one complete charge-then-discharge cycle before it delivers its rated 300mAh capacity. If the fitting went straight into a compliance test without a conditioning cycle first, the cell would have exhausted early. Run a full manual test now — hold the test button for the entire rated duration — then let the fitting charge for 24 hours before the next compliance test.

The fault LED on the OSA089 fitting is still lit after I confirmed the new 026-208 cell is correctly seated — how do I clear it?

Some Sure-Lite fittings latch the fault LED in hardware and will not clear it automatically once the fault condition is resolved. The cell being seated and the LED going out are two separate events on these units. Cycle the mains supply to the fitting off and back on — this triggers a controller reset and forces the fault register to re-read the cell voltage. If the LED stays on after a power cycle, check that the cell connector is fully engaged, as a partially seated connector reads as an open circuit.

The replacement 026-208 battery appears to be swollen after about two years in the fitting — is this a cell fault or a fitting problem?

Swelling in a Ni-Cd pack almost always indicates prolonged overcharge, typically from a trickle-charge circuit running continuously at an elevated ambient temperature inside the fitting enclosure. The cell itself is not defective from the factory — the damage accumulates over months when the fitting runs warmer than its rated operating range. Before fitting the replacement cell, check that the enclosure vents are clear and that the ambient temperature at the install location stays below 25°C. If the environment is consistently warmer, inspect the charge controller voltage — it should float at no more than 5.76V for a 4.8V Ni-Cd pack.

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