Ford Focus MK4 LX7T-AM 3.2V Compatible Battery 282A41872R
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Ford Focus MK4 LX7T-AM 3.2V Compatible Battery 282A41872R - is backordered and will ship as soon as it is back in stock.
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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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Ford Focus MK4 LX7T-AM 3.2V Compatible Battery 282A41872R - is backordered and will ship as soon as it is back in stock.
Voltage
3.2V
Amp
1500mAh
Ford Focus MK4 LX7T-AM — 3.2V LiFePO4 Replacement Battery (282A41872R)
This is a 3.2V 1500mAh LiFePO4 cell for the Ford Focus MK4 emergency assistance supply system. It fits the LX7T-AM unit and replaces OEM parts 282A41872R, A2C0145400000, and A2C0215090000. The emergency supply module uses this cell to maintain backup power for safety-critical functions when the main vehicle electrical system drops out.
- LX7T-AM emergency module fit: These OEM part numbers cross-reference the same 3.2V LiFePO4 cell used across the Focus MK4 emergency supply variants. The cell voltage, physical dimensions (70.00 × 19.80 × 18.60mm), and BMS handshake requirements are identical across all listed part numbers.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS accepted the cell without fault codes after a complete charge cycle. Voltage held stable at 3.2V nominal under load consistent with emergency lighting and communication draws.
- Post-install cycle requirement: After fitting this cell, the emergency supply module needs a full charge cycle before its management system will trust the battery state readings. Connect the vehicle to a running engine or approved charger and allow the module to complete its initialisation sequence before relying on it.
Why the LX7T-AM module shows a battery fault after a fresh cell install
The Focus MK4 emergency supply module runs a firmware-level battery check sequence on every startup. A newly fitted cell starts at a resting voltage the module has not yet verified through its own charge cycle, so it flags a battery fault rather than clearing immediately. This is not a defective cell — it is the module refusing to certify an uncalibrated source. Allow the module to sit on charge for at least two hours with the vehicle in a ready state, and the fault should clear as the management firmware completes its verification pass.
Emergency supply self-test failing after battery replacement
The self-test routine checks that the cell can deliver sufficient current to sustain emergency functions, not just that voltage is present. A cell that has not completed a full charge-discharge cycle will not have an accurate state-of-charge reading, and the module will fail the test as a result. Run one complete charge cycle after installation, then trigger the self-test again. If the test still fails after a full cycle, check the cell connection terminals for seating — the LX7T-AM connector requires firm contact to pass the current threshold check, typically above 3.0V under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Ford
- Manufacturer: CS
- Series: Standard
- Color: Blue
- Product Type: LiFePO4
- Battery Type: LiFePO4
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The emergency supply module still shows a battery warning two days after I fitted the new cell — what's causing it?
The LX7T-AM management firmware does not clear a battery warning until it has completed its own charge verification cycle, not just detected voltage at the terminals. A newly installed LiFePO4 cell at resting voltage is not enough — the module needs to observe the cell charging and reaching its full state before it trusts the reading. Leave the vehicle connected to a running engine or a 12V maintainer for at least two hours after fitting the cell. If the warning persists beyond that, reseat the cell connector and repeat the charge cycle.
The Focus MK4 emergency system self-test keeps failing even though the new battery reads 3.2V on a multimeter — why?
A resting voltage of 3.2V does not tell the module what it needs to know. The self-test applies a brief current draw to confirm the cell can actually sustain load, not just sit at nominal voltage. If the cell has not yet gone through a complete charge-discharge cycle inside the module, its internal resistance profile is uncalibrated and the test will fail. Complete one full charge cycle, then re-run the self-test — the cell needs to reach full charge and have that verified by the module's BMS before the test passes.
Why is the emergency supply draining faster than expected when the car sits unused in a warm garage?
LiFePO4 cells have lower self-discharge than other lithium chemistries, but elevated ambient temperature accelerates it. A warm garage — consistently above 25°C — can meaningfully increase the rate at which the standby cell loses charge between uses. The LX7T-AM module draws a small parasitic current to maintain readiness, and that compounds the effect in heat. If the vehicle sits unused for more than two to three weeks in a warm environment, connect it to a running engine for 20–30 minutes to allow the emergency supply cell to top back up to its rated 3.2V.
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