{"product_id":"carewell-ecg-1103-replacement-battery-144v-3400mah-li-ion","title":"Carewell ECG-1103 Replacement Battery 14.4V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCarewell ECG-1103 Series — 14.4V Li-ion Replacement Battery (HX-18650-14.4-2000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V 3400mAh lithium-ion replacement battery for the Carewell ECG-1103 portable electrocardiograph. It fits the ECG-1103, ECG-1103B, ECG-1103G, and ECG-1103L variants. Capacity matches the original specification at 48.96Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eECG-1103 series compatibility:\u003c\/strong\u003e\n    The B, G, and L variants of the ECG-1103 share the same 14.4V power rail, connector pinout, and BMS handshake protocol — one battery cell configuration covers all four models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through the ECG-1103 power-on sequence and monitored BMS communication. The charge IC accepted the cell, the BMS cleared all status flags, and the device advanced to its full diagnostic startup without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the ECG-1103 to complete its full power-on self-test without interruption. Medical-grade BMS firmware runs a verification routine at startup — cutting power during this sequence triggers a false battery fault flag that persists 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\"\u003eECG-1103 low battery alarm triggering on a freshly charged replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ECG-1103's BMS is calibrated to OEM cell chemistry. A new replacement cell has a slightly different internal resistance profile than the aged original, and the BMS threshold check at startup can read this as a low-state-of-charge condition. This clears after one complete charge-discharge cycle. Run the battery down through normal use, charge it fully to 16.8V, and the alarm will not recur on subsequent boots.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice will not complete boot sequence after battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If this battery sat long enough to drop below roughly 10V per pack, the ECG-1103's BMS will refuse to boot rather than risk operating on an undervoltage cell. Connect the charger and leave it for a full uninterrupted charge cycle — most BMS circuits begin trickle recovery automatically once the charger handshake is detected. Confirm the charge indicator advances before attempting to power on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381447589978,"sku":"BWCS-CRE103MX-1","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381447622746,"sku":"BWCS-CRE103MX-2","price":60.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381447655514,"sku":"BWCS-CRE103MX-3","price":67.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CRE103MX-1.webp?v=1778900876","url":"https:\/\/batteryweb.com\/products\/carewell-ecg-1103-replacement-battery-144v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}