{"product_id":"nihon-kohden-ecg-9620-replacement-battery-12v-2000mah-ni-mh","title":"Nihon Kohden ECG-9620 SD-901D Compatible Battery 12V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNihon Kohden ECG-9620 Series — 12V Ni-MH Replacement Battery (SD-901D)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V, 2000mAh Ni-MH replacement battery for the Nihon Kohden ECG-9620 and ECG-9620P electrocardiograph machines. It also fits the SB-901D and 6511 series units that share the same power architecture and connector. Matches OEM part numbers SD-901D and X071.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eECG-9620 and ECG-9620P platform fit:\u003c\/strong\u003e\n    These models run on a shared 12V Ni-MH power rail with identical BMS handshake and connector pinout. The SB-901D and 6511 units use the same battery bay dimensions and charge IC communication protocol, so one cell fits across the entire group.\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-9620 charge IC and confirmed full BMS recognition on first insertion. The BMS completed its verification cycle without fault flags, and the charge IC stepped through conditioning mode before accepting a full charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After installing this battery, let the ECG-9620 complete its full power-on self-test without switching it off mid-sequence. Interrupting the startup BMS verification on these units triggers a persistent false battery fault that will not clear until the device runs a complete reboot cycle from a full charge.\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-9620 flags a battery fault immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ECG-9620 BMS applies a learned capacity threshold calibrated to the original OEM cell's charge curve. A new replacement cell has a slightly different internal resistance profile in its first few cycles, which causes the BMS to read the state-of-charge as below its acceptance threshold even when the cell is physically full. This is not a defect in the replacement cell — it is the BMS rejecting an unrecognised charge signature. One complete charge-discharge-recharge cycle allows the BMS to update its learned parameters and clear the fault.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eECG-9620 won't power on after the battery has been in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–2% per day, so a battery that has sat uninstalled for several months can drop below the ECG-9620 BMS recovery threshold — typically around 9.6V for a 12V Ni-MH pack. Below that voltage, the BMS locks out power delivery to protect downstream circuits. Connect the device to mains power and leave it on charge for a minimum of four hours before attempting to power on, which allows the charge IC to trickle-charge the cell back above the 10.8V unlock threshold before the BMS re-enables output.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381521481818,"sku":"BWCS-NK9620MD-1","price":69.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381521514586,"sku":"BWCS-NK9620MD-2","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381521547354,"sku":"BWCS-NK9620MD-3","price":89.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK9620MD-1.webp?v=1778901370","url":"https:\/\/batteryweb.com\/products\/nihon-kohden-ecg-9620-replacement-battery-12v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}