Range Rover Discovery 4V Emergency Supply Replacement Battery 1200F
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Range Rover Discovery 4V Emergency Supply Replacement Battery 1200F - is backordered and will ship as soon as it is back in stock.
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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
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Delivery and Shipping
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Disclaimer
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Range Rover Discovery 4V Emergency Supply Replacement Battery 1200F - is backordered and will ship as soon as it is back in stock.
Voltage
4V
Amp
1200F
Range Rover Discovery 2017 / Evoque Series — 4V HPC Replacement Battery (72155811300)
This is a 4V, 1200F (4.8Wh) HPC supercapacitor battery for the Range Rover Discovery 2017, Evoque 2012, 2014, and 2015, among other compatible models. It slots into the vehicle's emergency supply circuit, maintaining backup power to critical systems when main power is interrupted. OEM part numbers include 72155811300, AC424034, DPLA-70720-AA, LR046049, LR112188, and T4N2591.
- Discovery and Evoque emergency supply platform: These models share the same emergency supply bay format, connector pinout, and BMS handshake protocol. The 4V HPC cell matches the voltage rail the management module expects — a mismatch here causes an immediate battery error flag on the vehicle's diagnostic system.
- Bench tested on actual hardware: We ran this cell through charge acceptance and discharge verification on the emergency supply circuit. The BMS accepted the battery without flagging a fault after a full initial charge cycle, and the supercapacitor responded correctly to simulated load pulls at the rated voltage.
- Post-install charge cycle on the Evoque and Discovery supply module: After fitting this battery, place the vehicle on a live ignition cycle for at least two hours before expecting the emergency module to trust the cell. The supply management firmware runs a battery-check sequence on first detection — skipping this step causes false error codes and the system will not arm the backup circuit.
Why the Discovery emergency supply module flags a battery error after a fresh install
The emergency supply management firmware on these Land Rover platforms does not immediately accept a new cell. It runs a multi-step battery-check sequence that compares charge acceptance rate and internal resistance against stored thresholds. A new HPC supercapacitor starts cold and may read outside those thresholds until it has completed at least one full charge cycle. Leave the vehicle with ignition on or engine running for two hours after fitting — the error flag clears automatically once the module passes its own verification sequence.
Emergency backup circuit not arming after battery replacement
If the emergency supply does not arm after the new battery is seated, the most likely cause is an incomplete charge state — the HPC cell needs to reach full voltage before the module enables the backup circuit. Check that the vehicle's main 12V supply is healthy; a weak main battery starves the charging rail and the supercapacitor never reaches the 4V threshold the firmware needs to see. Connect a known-good 12V supply or run the engine, then recheck after two hours. Confirm cell voltage at the connector reads 3.8V or above before expecting the backup circuit to arm.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Range Rover
- Manufacturer: CS
- Series: Standard
- Color: Blue
- Product Type: HPC
- Battery Type: HPC
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The emergency supply module is still showing a battery error two days after I swapped the cell — what's actually wrong?
The Discovery and Evoque emergency supply firmware runs a sequential battery-check cycle that can take longer than expected if the vehicle sits unused between drives. Each ignition cycle advances the check sequence, but it needs cumulative charge time to complete. Run the engine for two uninterrupted hours — this gives the charging rail consistent voltage to bring the HPC cell to full charge and lets the firmware finish its verification pass. Once the cell holds steady at 4V, the error clears on its own.
My Evoque's emergency supply self-test is failing even though the new battery looks fully seated — what causes that?
Self-test failure after a battery swap is almost always a calibration issue, not a fitment problem. The management module runs a charge-discharge reference cycle to map the new cell's capacity curve, and it needs a complete cycle before it trusts the runtime estimate. If the vehicle has only been driven short distances since the swap, the module hasn't had enough sustained charge time to finish that cycle. Leave the ignition on with the engine running for two hours, then trigger the self-test again — the module should pass once it has a full reference cycle on record.
The emergency backup drained much faster than expected during a power interruption — is the battery faulty?
Fast depletion is usually a load issue rather than a cell defect. The HPC supercapacitor is rated for the specific load profile Land Rover specified for this emergency circuit — if additional accessories or a fault elsewhere on the vehicle is drawing from the same backup rail, the cell depletes ahead of schedule. Check for any non-standard devices tapped into the emergency supply circuit and disconnect them. If the load matches OEM spec and depletion is still faster than expected, measure resting cell voltage with a multimeter — a healthy cell should read between 3.8V and 4V when fully charged.
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