{"product_id":"bmw-f01-740i-n54-30l-replacement-battery-48v-900mah-ni-mh","title":"BMW F01 740i Emergency Supply Replacement Battery 4.8V 900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBMW F01 740i \/ 750i Series — 4.8V Ni-MH Replacement Battery (84 10 9 297 787)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 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.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eF01 platform compatibility:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install charge cycle:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the F01 emergency module rejects a new battery on first power-up\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 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.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEmergency module self-test shows FAIL after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA 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.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360428556378,"sku":"BWCS-BMW787SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360428589146,"sku":"BWCS-BMW787SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360428621914,"sku":"BWCS-BMW787SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BMW787SL-1.webp?v=1778614637","url":"https:\/\/batteryweb.com\/products\/bmw-f01-740i-n54-30l-replacement-battery-48v-900mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}