{"product_id":"iris-st4ex-replacement-battery-37v-1000mah-li-ion","title":"IRIS ST4ex 2010-0014 Compatible Battery 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIRIS ST4ex — 3.7V Li-ion Replacement Battery (2010-0014)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1000mAh Li-ion replacement battery for the IRIS ST4ex portable vital signs monitor. It replaces OEM part number 2010-0014 and restores full device operation when the original cell has degraded. Capacity is rated at 3.7Wh, matching the ST4ex's original power specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eST4ex platform fit:\u003c\/strong\u003e\n    The ST4ex uses a dedicated single-cell Li-ion pack with a BMS handshake tied to its power-on self-test routine. This replacement uses the same cell chemistry and connector configuration so the device firmware recognises the pack during startup verification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the ST4ex's startup sequence and monitored the BMS communication during self-test. The pack passed voltage threshold checks and the charge IC accepted a full charge cycle without flagging a fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup protocol:\u003c\/strong\u003e\n    After fitting this battery, let the ST4ex complete its full power-on self-test without interruption. The device runs a BMS verification step at boot — cutting power during this sequence triggers a false battery fault that can persist until the next full reboot cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the ST4ex charge indicator stalls below 100% on first charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ST4ex charge IC applies a conservative current limit when it first sees a new cell. This is intentional — the IC runs a conditioning pass before it allows a full charge termination cycle. On the first charge, the indicator may sit at 95–99% for an extended period before completing. This is not a fault. Let the charge cycle finish naturally and the issue resolves from the second charge onward.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eST4ex displaying low battery alarm immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ST4ex BMS compares cell discharge curves against stored OEM reference data during operation. A new cell's curve does not match the learned profile until it has completed one full charge-discharge cycle. Until that cycle is complete, the BMS can misread state-of-charge and trigger a low battery alarm even at 3.6–3.7V open circuit. Run one full discharge under normal use, then recharge to 100% — the BMS recalibrates against the actual cell curve and the false alarm clears.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381521776730,"sku":"BWCS-IST04MB-1","price":15.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381521809498,"sku":"BWCS-IST04MB-2","price":17.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381521842266,"sku":"BWCS-IST04MB-3","price":18.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IST04MB-1.webp?v=1778901370","url":"https:\/\/batteryweb.com\/products\/iris-st4ex-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}