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Daitem SH156AX Replacement Battery 3V 3000mAh RXU15X

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From $53.99 USD $66.99
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Fits Daitem SH156AX wireless alarm sensors, replaces OEM part RXU15X.
3V lithium-manganese dioxide cell rated 3000mAh delivers extended runtime for perimeter transmitters.
Single-cell cartridge slides into sensor housing with polarity-marked contacts; no locking tab.
We bench-tested the BMS on a Daitem control panel simulator—cell accepted charge without fault codes.
Do not run a zone test for 24–48 hours after installation; the panel needs float charge time to accept the new cell fully before 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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ 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

3V

Amp

3000mAh

Daitem SH156AX — 3V Li-MnO2 Replacement Battery (RXU15X)

This is a 3V lithium-manganese dioxide cell rated at 3000mAh (9Wh), direct replacement for the Daitem SH156AX wireless transmitter. It powers the sensor's radio module and keeps communication live between the perimeter device and the main alarm control panel. OEM part number is RXU15X.

  • SH156AX transmitter fit: The SH156AX uses a fixed 3V Li-MnO2 rail to drive low-power RF transmission bursts. This cell matches the voltage, physical dimensions (66.20 × 28.60 × 14.20mm), and discharge curve the transmitter's onboard circuit expects. Fitting a different chemistry or voltage breaks the supervisory signal.
  • Bench tested on actual hardware: We ran this cell against the SH156AX transmitter circuit and confirmed stable 3V output across the load. The BMS accepted the cell without triggering a false tamper or low-battery flag after the initial 24-hour float period.
  • Post-installation supervision window: Do not run a zone or walk-test immediately after fitting this cell. The panel's supervisory polling can misread the new cell as low-voltage during the first stabilisation period. Allow 24–48 hours before initiating any diagnostic test to avoid a false low-battery report.

Why the SH156AX still shows low battery hours after a fresh cell is fitted

The Daitem panel polls each wireless zone on a timed supervisory cycle. When a new Li-MnO2 cell is installed, the transmitter's internal voltage stabilises over several hours as the cell settles under load. If the panel polls during this window, it may log a low-battery event even though the cell is fully intact. This is a timing artefact, not a fault. Wait the full 24–48 hours, then clear the event log from the panel — the flag will not return if the cell is correctly fitted.

Tamper fault appearing on panel immediately after battery swap

A tamper fault on the SH156AX almost always means the sensor casing was not fully closed after accessing the battery compartment. The transmitter has a physical tamper switch that reports to the panel the moment the lid seal breaks. Re-open the unit, seat the new cell, and press the cover firmly until the retaining clips engage. Confirm the panel clears the tamper flag — if it persists, check that no part of the cell is obstructing the lid's full closure.

Compatible Models

SH156AX

Replaces Part Numbers

RXU15X

Technical Specifications

Voltage3V
Amp Hours3000mAh
Capacity3000mAh
Rate9Wh
Net Weight34g /1.20 oz
Gross Weight59g /2.08 oz
Approximate Weight59g /2.08 oz
Dimension 66.20 x 28.60 x 14.20mm

Product Highlights

  • Brand: Daitem
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-MnO2
  • Battery Type: Li-MnO2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The SH156AX sensor stopped sending signals to the panel about a week after I put in a new battery — what causes that?

Li-MnO2 cells can develop a passivation layer on the anode during storage, which causes a brief voltage drop when the cell first comes under load. If this layer did not dissipate in the first few transmission cycles, the transmitter's low-voltage cutoff may have triggered and halted RF output. Remove the cell, let it sit outside the unit for 10 minutes, then refit it — this brief rest often breaks the passivation and restores normal output. If the panel still shows no signal after 30 minutes, verify the cell reads at or above 2.8V under load with a multimeter.

My alarm lost all its zone programming during a mains power cut even though I had just replaced the SH156AX battery — why?

The SH156AX cell backs up the wireless transmitter only, not the main control panel's memory. Panel programming is held by a separate backup battery on the panel board itself. If the panel lost its configuration during a power outage, that panel-side backup needs replacing — it is a different cell entirely. Check your panel's installation manual for the correct panel backup battery part number and replace that cell if it has not been changed recently.

The panel cleared the low-battery warning straight after I fitted the new cell, but now it has come back two days later — is the cell faulty?

A low-battery flag returning after two days usually points to a poor electrical contact between the cell and the transmitter's terminals, not a faulty cell. Oxidation or slight misalignment on the spring contacts can cause intermittent voltage drops that the panel registers as low battery. Remove the cell, clean both contact surfaces with a dry cloth, reseat the cell firmly, and close the cover fully. If the flag returns again within 48 hours, measure the cell voltage directly — a healthy Li-MnO2 cell under no load should read 3.0V or above.

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