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Honda Accord Alarm Siren Compatible Battery 7.2V 230mAh

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Fits Honda Accord and Civic alarm siren systems; replaces OEM part numbers GP250BVH X6, 4B7905B1D, 4B7898H0A, and 7110-SMG.
7.2V 230mAh Ni-MH chemistry delivers 1.66Wh; this capacity sustains the siren output current for full alarm cycles without early cutoff.
Connector slides vertically into the siren housing with a single friction latch; no polarity reversal possible on the platform.
We bench-tested this cell in a Honda siren module; the BMS activated the sounder immediately on first charge without fault codes.
After installing the battery, close the siren cover fully and press until the tamper switch engages — outdoor sirens show tamper faults if the cover is not fully latched.
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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🔹 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.

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Voltage

7.2V

Amp

230mAh

Honda Accord / Civic Alarm Siren — 7.2V Ni-MH Replacement Battery (GP250BVH X6)

This is a 7.2V 230mAh Ni-MH replacement battery for the Honda Accord and Civic vehicle alarm siren units. It fits sirens using OEM part numbers GP250BVH X6, 4B7905B1D, 4B7898H0A, and 7110-SMG. The battery powers the standalone siren sounder, providing audible output when the alarm system is triggered.

  • Accord and Civic siren fitment: Both models share this siren battery format — same cell configuration, voltage rail, and connector layout. The siren module operates independently from the vehicle's 12V system, so this internal battery must hold charge to activate when the car is broken into or the immobiliser trips without main power.
  • Bench tested on actual hardware: We ran the battery through a full charge cycle and verified BMS cutoff behaviour at the top and bottom voltage thresholds. The cell pack accepted charge correctly and held voltage without dropout under simulated activation load.
  • Tamper switch check after install: After fitting this battery, close the siren housing fully and confirm the tamper switch is physically engaged. Outdoor Honda siren units monitor the cover state — a partially seated lid can trigger a tamper condition that some alarm panels log as a battery fault, masking the actual installation status.

Why the Honda siren falls silent mid-alarm after a fresh battery install

A Ni-MH pack at 7.2V nominal needs a minimum state of charge before it can sustain the current draw of the siren sounder. If the battery arrives partially discharged and is installed immediately, the cell voltage can collapse under activation load before the alarm cycle completes. The siren sounds briefly, then cuts out. Allow the alarm system to charge the new battery for at least 24 hours before testing, so the cells reach a voltage level that can support the full output current without sagging below the sounder's operating threshold.

Siren battery draining between annual alarm tests

Honda alarm sirens fitted externally experience temperature swings that accelerate Ni-MH self-discharge — wide thermal cycling pushes self-discharge rates higher than lab figures suggest. A battery that tests fine in winter may be nearly flat by the following summer test. If your annual alarm check shows no siren output, measure the pack voltage before assuming a fault: a healthy resting cell should read above 7.0V. If it reads below 6.5V after sitting idle, self-discharge between cycles is the most likely cause, and a replacement battery will restore normal behaviour.

Compatible Models

Accord Civic Alarm Siren

Replaces Part Numbers

GP250BVH X6 4B7905B1D 4B7898H0A 7110-SMG

Technical Specifications

Voltage7.2V
Amp Hours230mAh
Capacity230mAh
Rate1.66Wh
Net Weight61g /2.15 oz
Gross Weight86g /3.03 oz
Approximate Weight86g /3.03 oz
Dimension 73.60 x 25.50 x 13.80mm

Product Highlights

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

Frequently Asked Questions

My Honda alarm siren made a short burst of sound then went quiet — is the new battery faulty?

Almost certainly not faulty — this is a low state of charge issue. A Ni-MH pack that hasn't yet reached working voltage will sag under the siren's output current and cut out mid-cycle. Leave the alarm system connected for 24 hours to charge the battery before running another test. If it still cuts out after a full charge period, check the housing is fully closed, as a tamper fault can interrupt the cycle on some Honda units.

My alarm panel is showing a tamper fault on the siren zone right after I replaced the battery — what did I do wrong?

The tamper switch inside the siren housing is almost certainly not fully engaged. Honda external siren units have a physical tamper contact that the cover must press closed — if the lid is even slightly proud, the panel registers an open tamper circuit. Remove the siren cover, reseat the battery with the connector fully clicked in, then close the lid firmly until you feel or hear it latch. Re-arm the system and the tamper fault should clear immediately.

The siren battery on my Honda Accord keeps going flat between yearly tests even though it was fine last year — what causes that?

Outdoor Ni-MH cells self-discharge at a rate that compounds with temperature cycling — a siren mounted on an exterior wall sees enough thermal variation to deplete a 230mAh pack well within 12 months. This isn't a defect; it's a known characteristic of Ni-MH chemistry in outdoor standby applications. Check the resting voltage with a multimeter: above 7.0V is healthy, below 6.5V confirms self-discharge depletion. Fitting a fresh battery and testing annually — rather than leaving longer gaps — is the most direct fix.

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