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BMW F01 740i Emergency Supply Replacement Battery 4.8V 900mAh

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Fits BMW F01 740i N54 3.0L and 173+ models; replaces OEM 84 10 9 297 787.
4.8V 900mAh Ni-MH emergency supply — provides temporary backup power during main battery failure.
Connector orientation and slot design match OEM emergency module housing; no adapter required.
We bench-tested the cell in the F01 module — BMS accepted the pack after one full charge cycle without fault codes.
After installation, run a complete charge cycle and perform the unit self-test — the management system requires this sequence to calibrate the battery runtime estimate before trusting the emergency supply during outage.
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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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

4.8V

Amp

900mAh

BMW F01 740i / 750i Series — 4.8V Ni-MH Replacement Battery (84 10 9 297 787)

This 4.8V 900mAh Ni-MH cell replaces the emergency power supply battery in BMW F01 series vehicles, including the 740i N54 3.0L, 750i N63 4.4L, xDrive variants, and the Alpina B7. It backs up critical safety functions when the main 12V system drops below operating threshold. OEM part numbers 9297787, 9371789, and 84109297787 all cross to this unit.

  • F01 platform compatibility: These models share the same emergency module housing, connector pinout, and BMS handshake voltage. The 4.8V rail and cell count match the OEM spec exactly across all listed variants, so no adapter or wiring change is needed.
  • Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the module and confirmed the BMS accepted the battery without a fault code. The protection circuit engaged correctly at low-voltage cutoff and cleared on recharge.
  • First-install charge cycle: After fitting, leave the vehicle on charge or run the engine long enough for the module to complete a full charge cycle before relying on the backup. The emergency supply controller will not log a valid runtime estimate until it has seen one complete cycle from the new cell.

Why the F01 emergency module rejects a new battery on first power-up

The emergency supply controller in the F01 runs a battery-check sequence every time a new cell is detected. It compares internal resistance and open-circuit voltage against stored thresholds before accepting the battery as serviceable. A freshly installed Ni-MH cell often sits slightly below the controller's acceptance voltage after shipping. Two hours on charge clears this state and allows the module to re-calibrate its capacity estimate against the new cell.

Emergency module self-test shows FAIL after battery swap

A self-test failure immediately after installation almost always means the controller has not completed a full charge-discharge calibration cycle on the new battery. The module uses that cycle to validate cell capacity — without it, the firmware flags the battery as unverified and fails the test. Run the vehicle or keep the ignition in accessory mode long enough to complete a full charge, then trigger the self-test again. The test should pass once the battery reaches a stable 4.8V and the controller logs a completed cycle.

Compatible Models

F01 740i N54 3.0L F01 750i N63 4.4L F01 750i xDriveN63 4.4L F01 Alpina B7 N63 4.4L F01 Alpina B7 xDrive N63 4.4L F02 740Ld xDrive N57 3.0L F02 740Li xDrive N55 3.0L F02 750Li N63 4.4L F02 750Li xDrive N63 4.4L F02 760Li N74 6.0L F02 ActiveHybrid 7 N55 3.0L F06 640i N55 3.0L F06 640i xDriveN55 3.0L F06 650i N63 4.4L F06 650i xDrive N63 4.4L F06 Alpina B6 xDrive N63 4.4L F06 M6 Gran Coupe S63 4.4L F07 535i N55 3.0L F07 535i xDrive N55 3.0L F07 550i N63 4.4L F07 550i xDrive N63 4.4L F10 528i N20 2.0L F10 528i N52 3.0L F10 528i xDrive N20 2.0L F10 535d N57 3.0L F10 535d xDrive N57 3.0L F10 535i N55 3.0L F10 535i xDrive N55 3.0L F10 550i N63 4.4L F10 550i xDrive N63 4.4L F10 ActiveHybrid 5 N55 3.0L F10 M5S63 4.4L F12 640i N55 3.0L F12 640i xDrive N55 3.0L F12 650i N63 4.4L F12 650iX N63 4.4L BF12 M6S63 4.4L F13 640i N55 3.0L F13 640i xDrive N55 3.0L F13 650i N63 4.4L F13 650iX N63 4.4L F13 M6 S63 4.4L F15 X5 sDrive35i N55 3.0L F15 X5 xDrive35d N57 3.0L F15 X5 xDrive 35i N55 3.0L F15 X5 xDrive40e N20 2.0L F15 X5 xDrive50i N63 4.4L F16 X6 sDrive35i N55 3.0L F16 X6 xDrive35i N55 3.0L F16 X6 xDrive50i N63 4.4L F22 228i N20 2.0L F22 228i xDriveN20 2.0L F22 230i B46 2.0L F22 230i xDriveB46 2.0L F22 M235i N55 3.0L F22 M235i xDrive N55 3.0L F22 M240i B58 3.0L F22 M240i xDrive B58 3.0L F23 228i N20 2.0L F23 228i xDrive N20 2.0L F23 230i B46 2.0L F23 230i xDriveB46 2.0L F23 M235i N55 3.0L F23 M235i xDrive N55 3.0L F23 M240i B58 3.0L F23 M240i xDrive B58 3.0L F25 X3 sDrive28i N20 2.0L F25 X3 xDrive28d N47 2.0L F25 X3 xDrive28i N20 2.0L F25 xDrive2.8i N52 3.0L F25 xDrive3.5i N55 3.0L F26 X4 M40iX N55 3.0L F26 X4 xDrive28i N20 2.0L F26 X4 xDrive35i N55 3.0L F30 320i N20 2.0L F30 320i xDrive N20 2.0L F30 328d N47 2.0L F30 328d xDriveN47 2.0L F30 328i N20 2.0L F30 328i xDrive N20 2.0L F30 330e iPerformance B48 2.0L F30 330i B48 2.0L F30 330i xDrive B48 2.0L F30 335i N55 3.0L F30 335i xDriveN55 3.0L F30 340i B58 3.0L F31 328d xDrive N47 2.0L F31 328i N20 2.0L F31 328i xDrive N20 2.0L F31 330i B48 2.0L F32 428i N20 2.0L F32 428i xDrive N20 2.0L F32 430i B46 2.0L F32 430i xDriveB46 2.0L F32 435i N55 3.0L F32 435i xDrive N55 3.0L F32 440i B58 3.0L F32 440i xDrive B58 3.0L F33 428i N20 2.0L F33 428i xDrive N20 2.0L F33 430i B46 2.0L F33 430i xDrive B46 2.0L F33 435i N55 3.0L F33 435i xDrive N55 3.0L F33 440i B58 3.0L F33 440i xDriveB58 3.0L F34 328i N20 2.0L F34 328i xDrive N20 2.0L F34 330i xDriveB46 2.0L F34 335i xDrive N55 3.0L F34 340i xDrive B58 3.0L F36 428i N20 2.0L F36 428i xDrive N20 2.0L F36 430i B46 2.0L F36 430i xDrive B46 2.0L F36 435i N55 3.0L F36 435i xDrive N55 3.0L F36 440i B58 3.0L F36 440i xDriveB58 3.0L F48 X1 sDrive28i B46 2.0L F48 X1 xDrive28i B46 2.0L F80 M3S55 3.0L F82 M4 S55 3.0L F83 M4 S55 3.0L F85 X5 M S63 4.4L F86 X6 M S63 4.4L F87 M2 N55 3.0L F87 M2 Competition S55 3.0L G29 Z4 sDrive M40i B58 3.0L G29 Z4 sDrive30i B46 2.0L I01 i3 IB3 I12 i8 B38 1.5L 3 3ER (F34 3ER (F80) 4ER (F32) 4ER (F33) F10 F20 F30 F34 1er (F21) 1er (F20) 2er (F45) 2er (F46) 2er (F23) 2er (F22) 3er (F30) 3er (F31) 3er (F34) 4er (F36) 5er (F10) 5er (F11) 5er (F07) 6er (F12) 6er (F13) 6er (F06) 7er (F01) 7er (F02) MINI 3-Türer (F56) 5-Türer (F55) Countryman (F60) Clubman (F54) Cabrio (F57) BMWi i3 (I01) 2er (F87) 4er (F83) 4er (F82) X1 (F48) X3 (F25) X4 (F26) X5 (F15) X5 (F85) X6 (F16) X6 (F86) F30 340i xDrive B58 3.0 F30 ActiveHybrid 3 N55 3.0L

Replaces Part Numbers

84 10 9 297 787 9297787 9371789 84109297787 9 297 787-02

Technical Specifications

Voltage4.8V
Amp Hours900mAh
Capacity900mAh
Rate4.32Wh
Net Weight55g /1.94 oz
Gross Weight80g /2.82 oz
Approximate Weight80g /2.82 oz
Dimension 46.00 x 42.50 x 11.00mm

Product Highlights

  • Brand: BMW
  • 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 F01's emergency supply still won't power anything during a simulated outage — I just put a new battery in yesterday. What's wrong?

The emergency supply controller needs a full charge cycle before it trusts the new cell enough to discharge through the load circuit. Until that cycle completes, the module holds the output off as a fault condition. Run the vehicle or leave it in accessory mode for at least two hours to let the battery reach a full charge. After that, the controller will enable the output and the supply will respond normally.

The battery I installed two months ago is already draining faster than expected — the module flags low battery within a week of a full charge. What causes that?

Ni-MH cells self-discharge at a higher rate than Li-ion, and that rate roughly doubles for every 10°C rise above ambient. If the module sits in a warm part of the engine bay or the car is parked in a hot environment regularly, the cell can lose a significant portion of charge between charge events. Check where the module is mounted and whether it gets direct heat soak. Parking in shade and ensuring the vehicle charges the module regularly will slow this down.

The F01 emergency module passed self-test fine after installation but now shows a battery error two weeks later — no warning before that. What triggers a delayed battery error?

The controller runs periodic background checks comparing the cell's resting voltage against a calibrated baseline. If the battery has partially self-discharged between charge events, the resting voltage can drop below the module's threshold and trigger a fault even though the cell itself is not failed. Start the vehicle and let it run for 20 minutes to push a charge back into the module. If the error clears and does not return after a normal drive cycle, the cell is fine — the fault was a low-state-of-charge trip, not a cell failure.

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