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BMW F44 228i xDrive Alarm Siren Compatible Battery 6V 300mAh Ni-MH

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Fits BMW F44 228i xDrive alarm siren, replaces OEM part 84 10 6 833 994-02.
6V, 300mAh Ni-MH cell powers the vehicle's integrated siren for theft and security alerts.
Connector slides into the siren housing with a friction fit — no locking tab.
We bench-tested the cell on a BMW alarm module simulator; BMS accepted charge at 6V nominal without fault codes.
After installation, close the siren cover fully and verify the tamper switch engages — outdoor sirens show false tamper faults if the cover latches incompletely.
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

6V

Amp

300mAh

BMW F44 228i xDrive Series — 6V Ni-MH Replacement Battery (84 10 6 833 994-02)

This is a 6V, 300mAh Ni-MH rechargeable cell for the integrated alarm siren fitted to BMW F44 and F90 platform vehicles. It fits the F44 228i xDrive, F44 M235i xDrive, F90 M5, F91 M8, and 52 additional variants using part number 84 10 6 833 994-02 or 84 10 6 833 994. The siren draws from this cell to sound theft alerts independently of the main vehicle battery.

  • F44 and F90 platform siren compatibility: These model lines share a common siren housing and connector spec. The cell dimensions — 55.00 × 37.10 × 14.70mm — match the OEM bay exactly, and the BMS handshake expects a 6V Ni-MH chemistry. Substituting a different voltage or chemistry will cause the alarm module to report a battery fault.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench to confirm BMS acceptance and proper float behaviour at full charge. The cell held stable voltage and the siren module cleared all fault codes throughout the test.
  • Siren cover re-engagement after swap: After fitting this cell, seat the siren cover firmly until you feel the latch click. The tamper switch inside the housing must make full contact. If it does not, the alarm panel flags a tamper fault — which some BMW modules display as a battery error rather than a cover fault.

Why the BMW siren battery discharges faster in outdoor temperature cycling

Ni-MH cells self-discharge faster than Li-ion, and that rate accelerates with thermal swings. A siren mounted in the engine bay or wheel arch sees large temperature deltas between summer and winter. Each cycle stresses the cell chemistry and raises the self-discharge baseline. On vehicles parked for extended periods, the siren cell can drop below the activation threshold before the annual alarm test is even triggered.

Siren fires briefly then cuts out mid-alarm

This happens when the cell voltage collapses under the siren's output current draw — the BMS detects an undervoltage condition and cuts power to protect the cell. A degraded or deeply discharged Ni-MH cell cannot sustain the current the siren demands for a full alarm cycle. The fix is a fresh cell followed by a full 24-hour charge before testing. Confirm the siren completes its full test cycle with voltage sitting above 5.4V under load.

Compatible Models

F44 228i xDrive F44 M235i xDrive F90 M5S63 F91 M8S63 F91 M8 Competition F92 M8S63 F92 M8 Competition F93 M8S63 F97 X3 M F98 X4 M G01 X3 M40i G01 X3 sDrive30i G01 x3 xDrive30e G01 X3 xDrive30i G02 X4 M40i G02 X4 xDrive30 G05 X5 M50i G05 X5 sDrive40i G05 X5 xDrive40i G05 X5 xDrive50i G06 X6 M50i G06 X6 sDrive40i G06 X6 xDrive40i G07 X7 M50i G07 X7 xDrive40i G07 X7 xDrive50i G11 740i G11 740i xDrive G11 745e xDrive G11 750i xDrive G11 Alpina B7 xDrive G11 M760i xDrive G14 840i G14 840i xDrive G14 M850i xDrive G15 840i G15 840i xDrive G15 M850i xDrive G16 840i G16 840i xDrive G16 M850i xDrive G20 330i G20 330i xDrive G20 M340i G20 M340i xDrive G29 Z4 sDrive M40i G29 Z4 sDrive30i G30 530e G30 530e xDrive G30 530i G30 530i xDrive G30 540d xDrive G30 540i G30 540i xDrive G30 M550i xDrive G32 640i xDrive

Replaces Part Numbers

84 10 6 833 994-02 84 10 6 833 994

Technical Specifications

Voltage6V
Amp Hours300mAh
Capacity300mAh
Rate1.8Wh
Net Weight42g /1.48 oz
Gross Weight67g /2.36 oz
Approximate Weight67g /2.36 oz
Dimension 55.00 x 37.10 x 14.70mm

Product Highlights

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

Frequently Asked Questions

My BMW alarm siren sounds for a second then goes silent — is that the battery failing?

Yes. When a Ni-MH siren cell degrades, its internal resistance rises and voltage collapses the moment the siren draws current. The BMS cuts output before the full alarm cycle completes. Replace the cell and allow a full 24-hour charge before running another alarm test — the siren should sustain output with cell voltage staying above 5.4V under load.

I replaced the siren battery but the alarm panel is still showing a battery or tamper fault — what did I miss?

The siren housing has a tamper switch that must make positive contact when the cover is latched. If the cover is not fully seated, the switch stays open and the panel logs a tamper fault — some BMW modules present this as a battery error, which causes confusion after a fresh install. Press the cover firmly until the latch clicks, then clear the fault via the vehicle's alarm system reset procedure.

The replacement battery was fine at install but the siren didn't sound at the next annual test — what causes that?

Ni-MH cells self-discharge at a higher rate than other chemistries, and outdoor temperature swings between annual tests accelerate that drain significantly. A cell installed correctly can sit below the minimum activation threshold twelve months later if the vehicle is parked for long periods without the alarm system keeping it topped up. After each annual test, confirm the siren module shows the battery as charged — if the charge circuit is not maintaining the cell, inspect the siren's charge input connection.

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