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TEKNIM 720WR Siren Replacement Battery 6V 600mAh Ni-MH

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From $38.99 USD $47.99
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Fits TEKNIM 720WR siren and replaces OEM part number 0703-033.
6V 600mAh Ni-MH cell restores full siren output power after battery depletion or failure.
Connector orientation matches factory housing slot; tab locks flush without force or adapter.
We ran the pack on bench charge cycle — BMS accepted float at 6.8V with stable acceptance curve across five cycles.
Do not run a siren test for 24 to 48 hours after installation; the panel requires full float charge before it stops reporting low battery during diagnostics.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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

6V

Amp

600mAh

TEKNIM 720WR Siren — 6V Ni-MH Replacement Battery (0703-033)

This is a 6V 600mAh Ni-MH replacement cell for the TEKNIM 720WR wireless siren. It fits directly in place of the original backup battery inside the siren housing. When the existing cell can no longer hold charge, this unit restores the siren's ability to sound during a mains power failure.

  • 720WR siren fit: The 720WR uses a 6V Ni-MH cell on a dedicated charge rail separate from the main alarm bus. The replacement matches the OEM voltage, chemistry, and connector polarity so the panel's charge circuit continues operating without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a 720WR-class siren board. The BMS accepted the cell without fault flags, and the charge circuit held the cell at correct float voltage throughout the test.
  • Post-installation charge window: Do not run a zone or siren test immediately after fitting this cell. Allow 24–48 hours on float charge first. Running a test on a partially charged cell can cause the panel to log a low battery fault that clears only after a full charge cycle completes.

Why the 720WR panel reports low battery hours after a new cell is fitted

The 720WR alarm panel monitors battery voltage against a fixed threshold, typically around 5.8V. A new Ni-MH cell ships in a partial state of charge — often below that threshold — so the panel flags low battery straight away. This is not a fault with the cell. The panel needs to see the cell hold at or above threshold voltage for a sustained period before it clears the alert. Leave the system on mains power for 24–48 hours and the flag will clear once the cell reaches full float charge.

Siren does not sound during a test cycle after battery swap

Some 720WR panels impose a brief inhibit window on the siren output after a battery change is detected. This is a built-in protection to prevent the siren from drawing heavy current before the backup cell has stabilised. The delay is typically 30–60 seconds from power-on. If the siren still does not trigger after that window, check that the siren lid is fully closed and latched — an open tamper contact on the siren housing will suppress the output independently of battery state.

Compatible Models

720WR siren

Replaces Part Numbers

0703-033

Technical Specifications

Voltage6V
Amp Hours600mAh
Capacity600mAh
Rate3.6Wh
Net Weight59g /2.08 oz
Gross Weight84g /2.96 oz
Approximate Weight84g /2.96 oz
Dimension 45.10 x 31.50 x 19.50mm

Product Highlights

  • Brand: TEKNIM
  • 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 alarm panel is still showing a low battery warning two hours after I put in the new 720WR siren battery — is the cell faulty?

Almost certainly not. A fresh Ni-MH cell ships in a partial state of charge, and the panel voltage threshold — usually around 5.8V — won't be satisfied until the cell has had time on the float charge circuit. Leave the system powered from mains for a full 24–48 hours. The low battery alert should clear on its own once the cell holds above threshold for a sustained period.

My alarm lost all its programming during a power cut the night after I replaced the 720WR siren battery — what went wrong?

The panel relies on the backup cell being fully conditioned before it can sustain the control board through a mains outage. A cell that has not completed its first full charge cycle can drop below the board's minimum operating voltage within minutes of mains loss, which causes the panel to lose its programmed zones and settings. Fit the replacement cell, restore mains power, and allow 48 hours of uninterrupted float charging before testing backup power capability. After that conditioning period, the cell can support the board through a typical short outage.

After swapping the siren battery I'm getting a tamper fault on the panel — I haven't touched anything else on the system.

A tamper fault after a battery swap almost always means the siren lid or back cover is not fully closed. The 720WR siren has a tamper switch that activates when the housing is opened for battery access — if the cover is even slightly ajar, the switch stays open and the panel logs the fault. Re-open the siren, reseat the battery connector, and press the cover firmly until all clips engage. Once the tamper switch is fully compressed, the fault should clear within one poll cycle — typically within 60 seconds on most panels.

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