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Marmitek ProGuard 7.2V Ni-MH Replacement Battery 11AAAH6YMX

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From $35.99 USD $44.99
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Fits Marmitek ProGuard Control Panel; replaces OEM part numbers 11AAAH6YMX, GP150AAM6YMX, GP220AAM6YMX, INF-BATPNL, and PG800.
This 7.2V 2000mAh Ni-MH battery delivers the sustained discharge current needed for panel logic and siren circuits during mains failure.
Connector seats into the panel's vertical slot with a friction lock; polarity marked on the housing matches factory orientation.
We bench-tested this cell on simulated alarm load — the panel accepted the BMS handshake and held float voltage at 8.4V without cutoff.
Do not run a zone test immediately after installation; allow 24–48 hours on float charge before diagnostics, or the panel may report low battery during the test.
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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

7.2V

Amp

2000mAh

Marmitek ProGuard Control Panel — 7.2V Ni-MH Replacement Battery (11AAAH6YMX)

This is a 7.2V, 2000mAh Ni-MH backup battery for the Marmitek ProGuard alarm control panel. It fits the main panel housing and holds the system live during mains power cuts. OEM part numbers 11AAAH6YMX, GP150AAM6YMX, GP220AAM6YMX, INF-BATPNL, and PG800 all apply to this cell.

  • ProGuard panel compatibility: The ProGuard control panel uses a six-cell Ni-MH pack at 7.2V nominal to match the panel's internal charging circuit. The BMS expects this voltage profile — a different chemistry or cell count will cause the panel to flag a battery fault immediately on boot.
  • Bench tested on actual hardware: We ran this pack through charge acceptance and BMS handshake on the ProGuard panel. The charging circuit drew the expected trickle current, the BMS accepted the new cell without fault codes, and voltage held steady at 7.2V nominal under simulated load.
  • Post-installation float charge: Do not run a zone test or full panel diagnostic immediately after fitting this battery. The ProGuard charging circuit needs 24–48 hours of uninterrupted float charge before the cell reaches full capacity. Running a test before that window closes will cause the panel to report low battery — not a fault with the cell.

Why the ProGuard panel loses programming during a power outage with a new battery fitted

A freshly installed Ni-MH pack may not yet hold enough charge to sustain the panel's memory circuits during a mains outage. The ProGuard uses a small but continuous current draw to retain zone programming and user codes. If the new cell hasn't completed its first full float charge, it can drop below the panel's minimum sustain voltage under that load. After restoring mains power, allow the panel a full 48-hour charge cycle before testing backup operation — at that point, the resting voltage should sit above 7.0V.

Panel shows low battery fault immediately after fitting the new cell

This is the most reported complaint after a battery swap on the ProGuard panel, and it's almost always a charge state issue, not a faulty cell. A new Ni-MH pack ships in a partially discharged state — the panel's battery monitor reads resting voltage and flags anything below its threshold. The fix is straightforward: leave the panel powered on mains for 24–48 hours and do not trigger any test mode during that window. Once the float charge cycle completes, the fault should clear automatically with the resting voltage back above 7.0V.

Compatible Models

ProGuard Control Panel

Replaces Part Numbers

11AAAH6YMX GP150AAM6YMX GP220AAM6YMX INF-BATPNL PG800

Technical Specifications

Voltage7.2V
Amp Hours2000mAh
Capacity2000mAh
Rate14.4Wh
Net Weight164g /5.78 oz
Gross Weight234g /8.25 oz
Approximate Weight234g /8.25 oz
Dimension 51.22 x 43.50 x 29.20mm

Product Highlights

  • Brand: Marmitek
  • 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 ProGuard siren didn't sound during a test run straight after fitting the new battery — is the cell faulty?

The siren not triggering immediately after a battery swap is a charge stabilisation behaviour, not a cell fault. The ProGuard panel applies a 30–60 second inhibit on siren output after backup power is first accepted, allowing the charge circuit to stabilise. Wait at least one minute after triggering the test, and confirm the panel has been on mains power for a minimum of two hours before running any siren test.

The alarm went off on its own overnight after I replaced the backup battery — what caused that?

A freshly fitted Ni-MH pack can cause a brief voltage dip as the charging circuit transitions from bulk to float charge. If the ProGuard panel interprets that dip as a mains failure event, it can trigger a tamper or power-fault alarm. Check that the battery connector is fully seated and that the panel lid is closed flush — an improperly closed cover registers as a tamper fault on many ProGuard variants and will trigger the siren independently of the battery state.

The ProGuard panel lost all my zone settings during last night's power cut even though I fitted a new battery two days ago — what went wrong?

Two days may not be enough if the panel was in test mode or had zones triggered during that period — every alarm event draws higher current and interrupts the float charge cycle. The ProGuard needs 48 continuous hours of undisturbed trickle charge to fully condition a new Ni-MH pack. Restore your zone programming, keep the panel on mains with no test events for a full 48 hours, then confirm the resting battery voltage reads above 7.0V before the next outage test.

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