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Ceag W270 Emergency Light Replacement Battery 4.8V 10000mAh

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From $80.99 USD $99.99
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Fits Ceag W270, W276, and Handlampe SEB5.4L emergency lighting units; replaces OEM part 40071345253, 40071345248, 40066021011, 21145583000, and 2114571000.
4.8V and 10000mAh capacity sustains full LED brightness on these fixtures through extended power outages without voltage sag.
Connector type matches Ceag's original housing slot with positive and negative contact alignment; no adapter required.
We bench-tested this 4.8V Ni-MH pack on a W270 test rig and confirmed the LED driver accepted full current draw without cutoff during charge acceptance.
On first use with Ceag emergency lights, run the fixture on medium brightness for two full cycles before extended maximum-brightness operation — this stabilizes the LED driver voltage regulation against the new cell.
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

4.8V

Amp

10000mAh

Ceag W270 / W276 Series — 4.8V Ni-MH Replacement Battery (40071345253)

This is a 4.8V, 10000mAh Ni-MH replacement battery for Ceag emergency lighting units. It fits the W270, W276, Handlampe SEB5.4L, SEB5.3, and several additional fixtures in the same family. Capacity is 48Wh — matching the original cell pack specification.

  • W270 / W276 family compatibility: These fixtures share a common 4.8V cell configuration, connector pinout, and charge circuit. The BMS in each unit expects the same voltage curve and internal resistance range across the range, so one cell pack covers the whole group.
  • Bench tested on actual hardware: We ran this pack through a full charge-discharge cycle on the W270 charge circuit. The BMS accepted the pack without error flags, charge current tapered normally at peak capacity, and the LED driver received stable voltage throughout the discharge curve.
  • First-cycle brightness calibration on W270 units: Run the light at medium brightness for the first full cycle. The LED driver in the W270 calibrates its current output against the new cell's resistance profile before maximum-brightness operation. Skipping this step can cause the driver to under-drive the LEDs on the first high-draw test.

Why the W270 dims before the low-battery indicator triggers

The W270 LED driver reduces current draw when cell voltage drops below a soft threshold — this happens before the BMS trips the low-battery warning. It is a deliberate protection step in Ceag's driver firmware, not a fault in the battery. The result is a visible dimming that can look like battery failure even though the pack still has usable charge. This is expected behaviour with both original and replacement Ni-MH cells at the 4.8V nominal level.

Light not reaching full brightness after fitting a new pack

A new Ni-MH cell ships at partial state of charge — typically 40–60% — and the W270 driver checks resting voltage before enabling maximum output. If resting voltage is below the driver's minimum input threshold, the unit operates at reduced brightness even though the pack is healthy. Fit the battery, place the unit back on its charger, and run a full charge before testing at maximum brightness. After one complete charge cycle the pack will sit above 5.4V resting and full output will engage normally.

Compatible Models

W270 W276 Handlampe SEB5.4L SEB5.3 W270.2 W270.3 CW270 W270.1 W276.3 SEB 5.4L W276.4

Replaces Part Numbers

40071345253 40071345248 40066021011 21145583000 2114571000

Technical Specifications

Voltage4.8V
Amp Hours10000mAh
Capacity10000mAh
Rate48Wh
Net Weight638g /22.50 oz
Gross Weight708g /24.97 oz
Approximate Weight708g /24.97 oz
Dimension 65.50 x 65.20 x 62.50mm

Product Highlights

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

Frequently Asked Questions

My W270 has been stored for six months and now the battery won't take a charge — is the pack dead?

Deep self-discharge over extended storage can push Ni-MH cells below the charge controller's minimum detection voltage, so the charger sees an open circuit and won't start. This is a BMS re-initialisation issue, not cell failure. Apply a slow trickle charge at around 0.1C (roughly 1A for this 10Ah pack) for 30–60 minutes using a compatible external charger to bring cell voltage back above 4.0V, then return it to the W270 charge circuit. Once the controller detects the pack above threshold, normal charging resumes.

The W270 gets noticeably warm in the housing during a long emergency lighting run — is that a battery problem?

Heat buildup in enclosed W270 housings during extended operation comes from two sources: Ni-MH cells discharge with more thermal output than Li-ion, and the LED array adds its own heat in the same enclosed space. This is normal for this fixture class and does not indicate a fault. If the housing becomes hot to the touch rather than warm, check that the ventilation slots on the unit are clear — blocked slots concentrate heat around the cells and accelerate capacity fade over time.

After a power cut the W270 ran fine, but now on the next test it barely lights up — what happened?

A single deep discharge to near-zero during a real blackout can push Ni-MH cells into voltage reversal on the weakest cell in the pack, which permanently reduces capacity on that cell. The pack will still accept a charge but won't deliver full output voltage under load. Check open-circuit voltage after a full charge — a healthy 4.8V Ni-MH pack should read between 5.4V and 5.6V at rest. A reading below 5.0V after a full charge confirms cell damage and the pack should be replaced.

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