{"product_id":"range-rover-discovery-2017-replacement-battery-4v-1200f-hpc","title":"Range Rover Discovery 4V Emergency Supply Replacement Battery 1200F","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRange Rover Discovery 2017 \/ Evoque Series — 4V HPC Replacement Battery (72155811300)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 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.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDiscovery and Evoque emergency supply platform:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install charge cycle on the Evoque and Discovery supply module:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Discovery emergency supply module flags a battery error after a fresh install\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 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.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEmergency backup circuit not arming after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf 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.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360428261466,"sku":"BWCS-RTL720SL-1","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360428294234,"sku":"BWCS-RTL720SL-2","price":48.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360428327002,"sku":"BWCS-RTL720SL-3","price":53.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-RTL720SL-1.webp?v=1778614656","url":"https:\/\/batteryweb.com\/products\/range-rover-discovery-2017-replacement-battery-4v-1200f-hpc","provider":"BatteryWeb","version":"1.0","type":"link"}