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DSC PG9920 Repeater 4.8V Ni-MH Compatible Battery BATT1.3-4.8V

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From $28.99 USD $35.99
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Fits DSC PG9920 Repeater and replaces OEM part numbers BATT1.3-4.8V, 3W-BAT1348V, and MGH00387.
4.8V at 1500mAh delivers the exact charge capacity this repeater needs to maintain wireless signal boost between panel and remote sensors.
Connector slides straight into the battery slot with a single locking tab — no forced insertion required on this Ni-MH platform.
We bench-tested this cell in the PG9920 housing; the BMS float-charged cleanly and showed stable voltage draw under repeater RF load.
Wait 24 to 48 hours after installation before running zone tests — the panel's backup battery circuit needs full float charge before accepting the new cell.
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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

1500mAh

DSC PG9920 Repeater — 4.8V Ni-MH Replacement Battery (BATT1.3-4.8V)

This is a 4.8V, 1500mAh Ni-MH battery for the DSC PG9920 wireless repeater and compatible DSC alarm system components. The PG9920 extends wireless range between your control panel and remote sensors — when this battery degrades, that link becomes unreliable or drops entirely. Fits the PG9920 Repeater, wireless DSC-56, WP8010-SP, and Central WP8010 series panels.

  • PG9920 and WP8010 platform compatibility: These units share a 4.8V NiMH cell format with a matched connector and BMS charge acceptance profile. Swapping a mismatched chemistry or voltage will cause the panel to reject the cell or report a persistent fault condition.
  • Bench tested on actual hardware: We ran this cell through charge acceptance on a DSC-compatible test rig. The BMS accepted the cell without faulting, and float charge stabilised within the expected window. No false low-battery flags were thrown after the conditioning period completed.
  • Post-installation hold period: Do not run a zone or diagnostic test immediately after fitting this cell. The DSC panel needs 24–48 hours on float charge before its BMS reports accurate battery status. Testing too early will generate a low-battery alert even on a fully functional new cell.

Why the PG9920 loses wireless coverage after a battery swap

The PG9920 is a powered repeater — it actively retransmits signals rather than passively relaying them. When the backup cell voltage drops below the repeater's operating threshold, the unit stops retransmitting even if mains power is present. After fitting a new cell, the repeater needs time to stabilise at full charge before it resumes normal range performance. If sensors at the edge of coverage are still dropping after 48 hours, check that the new cell is seated firmly and the connector is fully engaged.

Panel shows low battery fault hours after installing a new cell

This is a BMS reporting lag, not a faulty battery. DSC panels sample backup cell voltage on a fixed cycle, and a freshly installed NiMH cell often reads below the panel's acceptance threshold until it has completed an initial charge cycle. The fault clears itself once the cell reaches float voltage — typically around 5.5–5.8V across a fully charged 4.8V NiMH pack. Leave the system powered for a full 48 hours, then check panel status again before assuming the cell is defective.

Compatible Models

PG9920 Repeater wireless DSC-56 WP8010-SP Central WP8010 central WP8030 Wireless Alarm Repeater

Replaces Part Numbers

BATT1.3-4.8V 3W-BAT1348V MGH00387

Technical Specifications

Voltage4.8V
Amp Hours1500mAh
Capacity1500mAh
Rate7.2Wh
Net Weight98g /3.46 oz
Gross Weight123g /4.34 oz
Approximate Weight123g /4.34 oz
Dimension 50.00 x 28.80 x 28.50mm

Product Highlights

  • Brand: DSC
  • 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

The DSC panel is still showing a low battery warning two days after I replaced the cell — what's going on?

If the fault persists past 48 hours, the most likely cause is a poor connection at the battery header rather than a failed cell. Disconnect and firmly reseat the connector, then check that no pin is bent or oxidised. After reseating, give the panel another 24 hours on mains power — the BMS needs a complete charge cycle to clear the fault flag. If the warning remains after that, measure across the battery terminals with a multimeter: a healthy charged 4.8V NiMH pack should read between 5.4V and 5.8V.

The alarm lost its programming during a power cut even though I just fitted a new backup battery — why didn't it hold?

A freshly installed NiMH cell may not yet have enough charge stored to sustain the panel through a mains outage, especially if the outage happened within the first 24–48 hours of installation. The cell needs at least one full charge cycle on float before it can deliver meaningful backup capacity. If you had a power cut before that window closed, the panel may have drained the cell faster than it could respond. Restore mains power, allow 48 hours of uninterrupted charging, then confirm the panel retains programming through a controlled breaker test.

My DSC system's tamper fault won't clear after swapping the PG9920 battery — what triggers that?

A tamper fault after a battery swap almost always means the repeater or panel housing wasn't fully closed after access. DSC units use a mechanical tamper switch on the lid or back plate — if the cover is even slightly misaligned, the switch stays open and the panel logs the fault. Open the enclosure, check that the tamper switch plunger depresses fully when the lid seats, then close it firmly until it clicks. The fault should clear within one polling cycle — typically within 60 seconds of the lid being properly seated.

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