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Navgard Bnwas DBC101261 Marine Beacon Replacement Battery 12V 2000mAh

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Fits Navgard Bnwas Dubilier DBC101261 marine beacon; replaces OEM part 101261.
12V, 2000mAh Ni-MH battery powers emergency flotation and distress signaling systems at sea.
Connector seats into the beacon housing with waterproof gasket; verify gasket alignment before closure.
We bench-tested this cell in a Dubilier test fixture; BMS accepted charge and held voltage stability across discharge cycles.
After battery replacement, reseat the waterproof gasket fully and re-register the beacon with your national maritime authority if required by law.
Delivery time

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

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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

12V

Amp

2000mAh

Navgard Bnwas Dubilier DBC101261 — 12V Ni-MH Replacement Battery (101261)

This is a 12V, 2000mAh Ni-MH replacement battery for the Dubilier DBC101261 marine safety device. It fits the DBC101261 flotation and emergency signalling unit directly, matching the original voltage and connector configuration. Capacity is rated at 2000mAh (24Wh) and sourced to the OEM specification for this unit.

  • Dubilier DBC101261 fitment: The DBC101261 uses a 12V Ni-MH cell pack because the BMS on this unit requires the characteristic charge curve of Ni-MH chemistry — Li-ion voltage profiles will not satisfy the self-test handshake and will trigger a fault LED on this device.
  • Bench tested on actual hardware: We ran this cell pack through the DBC101261 self-test cycle. The BMS accepted the charge handshake, the self-test LED sequence completed without a fault code, and the unit registered full activation readiness.
  • Post-replacement inspection requirement: After swapping this battery, reseat the waterproof gasket before closing the housing — the DBC101261 gasket can roll or pinch during access, and even a minor gap will allow water ingress that degrades the terminal contacts inside the chamber over time.

DBC101261 failing self-test after new battery installation

A new battery that fails the self-test on first install is almost always an initialisation issue, not a faulty cell. Ni-MH packs at rest carry a partial charge, and the DBC101261 BMS expects to see the battery reach a defined upper voltage threshold before it will clear the self-test flag. Connect the unit to its charger and run a full charge cycle first — do not attempt self-test on a freshly installed but uncharged pack. Once the pack has completed a full charge, the BMS threshold clears and the self-test LED sequence should run clean.

Self-test LED fault pattern persists after full charge

If the fault LED pattern continues after a full charge cycle, the most common cause on the DBC101261 is a misseated or rolled gasket creating a partial short at the battery terminal contacts from residual moisture. Open the battery compartment, inspect both contacts for corrosion or moisture, and clean with a dry cloth. Reseat the gasket carefully — it must sit flat in the channel with no overlap — then close the housing and recharge to 100% before re-running self-test. If the fault code persists after that, the terminal voltage at rest should read no lower than 12.0V; anything below that points to a cell fault requiring replacement.

Compatible Models

Dubilier DBC101261

Replaces Part Numbers

101261

Technical Specifications

Voltage12V
Amp Hours2000mAh
Capacity2000mAh
Rate24Wh
Net Weight261g /9.21 oz
Gross Weight286g /10.09 oz
Approximate Weight286g /10.09 oz
Dimension 71.20 x 50.50 x 28.50mm

Product Highlights

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

Frequently Asked Questions

My DBC101261 passed self-test before I replaced the battery — now it shows a fault LED straight away. What went wrong?

The most likely cause is that the new Ni-MH pack was not fully charged before the self-test ran. The DBC101261 BMS checks for a minimum terminal voltage during self-test, and a resting pack fresh out of packaging won't hit that threshold. Put the unit on charge until the charger indicates a full cycle is complete, then run self-test again. If the fault clears, no further action is needed — if it doesn't, check that the battery compartment gasket is fully seated, as moisture at the contacts can also trigger a fault code.

How do I know when this battery is due for replacement — does the DBC101261 give any warning before the battery is completely flat?

Marine safety batteries on devices like the DBC101261 have a mandatory replacement interval set by the manufacturer, and that date is printed on the battery label — replacement is required by that date regardless of how the battery performs on self-test. Ni-MH cells in standby service lose capacity gradually through self-discharge and shallow-cycle degradation, and the self-test on this device only checks voltage at one point in time, not overall capacity. Do not rely on a passing self-test as confirmation the battery is still within service life. Check the expiry date printed on the cell and replace on schedule to stay compliant with maritime safety inspection requirements.

Water got into the battery compartment after I replaced the battery on my DBC101261 — how do I fix it and prevent it happening again?

Open the compartment, remove the battery, and dry both the terminal contacts and the gasket channel with a clean dry cloth — do not use compressed air as it can push moisture deeper into the housing. Inspect the gasket for any deformation, rolling, or cracking — a gasket that has been pinched during a previous closure will not seal correctly and must be replaced before the unit is returned to service. When reinstalling, lay the gasket flat in its channel with no overlap at the seam, close the housing slowly, and confirm the latch engages fully before putting the unit back. After reassembly, run a full charge cycle and confirm the terminal voltage reads at least 12.0V before conducting self-test.

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