{"product_id":"omron-m20-replacement-battery-111v-2500mah-li-ion","title":"Omron M20 Blood Pressure Monitor Replacement Battery 11.1V 2500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOmron M20 \/ M30 \/ P30 \/ Z207 — 11.1V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V 2500mAh Li-ion battery replaces the internal rechargeable cell in the Omron M20, M30, P30, and Z207 automatic upper arm blood pressure monitors. All four models share the same voltage rail and physical form factor, making this a direct swap. Capacity is rated at 2500mAh (27.75Wh) — matching the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eM20 \/ M30 \/ P30 \/ Z207 platform:\u003c\/strong\u003e\n    These four monitors share the same internal battery bay dimensions (68.50 × 71.00 × 58.50mm), 11.1V power rail, and BMS handshake protocol. A single cell variant covers all four without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the M20's charge-discharge sequence and confirmed the BMS accepted the new cell without throwing a battery fault. Charge termination triggered correctly at full capacity on the second cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup routine:\u003c\/strong\u003e\n    After installing this battery, allow the monitor to complete its full power-on self-test without interruption. Omron's BMS runs a verification sequence at startup — cutting power mid-test can register a false battery fault that persists until the next clean reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSelf-test failure after battery swap in the Omron M20\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe M20's BMS is calibrated to OEM cell chemistry profiles. A new third-party cell starts with no charge history, so the BMS may flag an internal inconsistency during its first self-test. This is not a defective battery — it is the BMS learning the new cell's internal resistance curve. Run one complete charge-discharge cycle before using the monitor for any clinical readings. After that cycle, the self-test passes cleanly on every subsequent boot.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharge indicator not reaching 100% on the first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe M20's charge IC applies a conservative current limit when it detects a new or unfamiliar cell. On the first charge, the indicator may stall at 90–95% and the monitor may report \"charging complete\" before the cell is geometrically full. This is the charge IC protecting the cell during its initial conditioning pass. Discharge fully and recharge once — subsequent charges will terminate correctly at 100% with the cell at full 27.75Wh capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381398372442,"sku":"BWCS-CKP121MD-1","price":146.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381398405210,"sku":"BWCS-CKP121MD-2","price":174.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381398437978,"sku":"BWCS-CKP121MD-3","price":195.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CKP121MD-1.webp?v=1778900536","url":"https:\/\/batteryweb.com\/products\/omron-m20-replacement-battery-111v-2500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}