{"product_id":"nihon-kohden-ecg-6851k-replacement-battery-12v-2300mah-sealed-lead-acid","title":"Nihon Kohden ECG-6851K 12V Replacement Battery LCT-1912NK","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNihon Kohden ECG-6851K Series — 12V Sealed Lead Acid Replacement Battery (LCT-1912NK)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V 2300mAh sealed lead-acid battery for the Nihon Kohden ECG-6851K electrocardiograph and related models including the ECG-6511, ECG-6620P, and ECG-9130P. It provides backup and portable power for clinical ECG recording and cardiac diagnostic use. OEM part number is LCT-1912NK.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eECG-6851K series compatibility:\u003c\/strong\u003e\n    These models share the same 12V power rail, physical footprint, and connector pinout. The BMS in each unit uses the same charge acceptance profile, so a single cell chemistry covers the full range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the ECG-6851K charge cycle and monitored BMS handshake at startup. The battery passed the device self-test on the second cycle once the BMS registered a full charge-discharge sequence.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, let the ECG complete its full power-on self-test without interrupting the boot cycle. Nihon Kohden electrocardiographs verify battery state during startup — cutting power mid-sequence trips a latching fault flag that will not clear until the next full reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the ECG-6851K reports a battery fault after a fresh installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSealed lead-acid cells ship in a partial state of charge to reduce sulfation during storage. The ECG-6851K BMS compares resting voltage against a threshold calibrated for a fully conditioned cell. A new battery sitting below 12.6V at rest will trigger a fault flag on first boot even if the cell is otherwise functional. One full charge cycle — allowing the charger to reach float stage — brings resting voltage into the acceptance window and clears the fault on the next startup.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator stalling below 100% on the first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ECG charge IC applies a conservative current limit when it detects internal resistance above the conditioned-cell baseline — common on any new sealed lead-acid cell. This causes the charge bar to slow or stall in the final 10–15% of the first charge cycle. The cell is still accepting charge; the IC is limiting current until resistance drops. Let the charge run uninterrupted to float stage, which the charger signals by dropping current to below 50mA at the terminals.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381521285210,"sku":"BWCS-NK6511MD-1","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381521317978,"sku":"BWCS-NK6511MD-2","price":126.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381521350746,"sku":"BWCS-NK6511MD-3","price":141.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK6511MD-1.webp?v=1778901370","url":"https:\/\/batteryweb.com\/products\/nihon-kohden-ecg-6851k-replacement-battery-12v-2300mah-sealed-lead-acid","provider":"BatteryWeb","version":"1.0","type":"link"}