{"product_id":"baxter-healthcare-sigma-spectrum-infusion-pumps-replacement-battery-74v-3000mah-li-ion","title":"Baxter Healthcare Sigma Spectrum Infusion Pump Battery 7.4V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBaxter Healthcare Sigma Spectrum Infusion Pumps — 7.4V Li-ion Replacement Battery (35724)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 3000mAh Li-ion battery is a direct replacement for the Baxter Healthcare Sigma Spectrum infusion pump. It fits pump models 35083, 35162, 35700, and additional Sigma Spectrum variants sharing OEM part numbers 35724 and 6296-A. Voltage and capacity match OEM specifications exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSigma Spectrum model compatibility:\u003c\/strong\u003e\n    Models 35083, 35162, and 35700 share the same 7.4V battery bay, connector pin-out, and BMS handshake protocol. Any Sigma Spectrum variant carrying OEM reference 35724 or 6296-A accepts this cell without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery through full charge-discharge cycles on a Sigma Spectrum unit. The BMS completed its verification sequence without fault codes, and the charge IC accepted the cell on the first cycle without applying a rejection flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePower-on self-test protocol:\u003c\/strong\u003e\n    After installing this battery, allow the pump to complete its full power-on self-test without interruption. The Sigma Spectrum runs a BMS verification routine at startup — cutting power mid-sequence triggers a persistent false battery fault that will not clear until the next complete 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 Sigma Spectrum alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Sigma Spectrum's BMS compares incoming cell data against a calibration threshold tuned to aged OEM chemistry. A new cell with a fresh charge curve looks different to the BMS than a worn in-situ cell, and the system flags it as below threshold. This is not a fault with the battery. Running one complete charge-discharge cycle allows the BMS to map the new cell's discharge curve and update its internal reference. After that first full cycle, the low-battery alarm clears and does not return.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePump will not power on after battery sat in storage before installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the cell voltage dropped below approximately 2.5V per cell — 5.0V at pack level — the Sigma Spectrum's BMS enters a lockout state and refuses to engage the pump's boot sequence. Connect the pump to mains power first, not battery power. The charge IC will apply a low-current pre-charge trickle to recover the cell voltage above the BMS recovery threshold, typically 6.0V at pack level, before switching to standard CC-CV charging. Once charging begins normally, the pump will boot.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381478752346,"sku":"BWCS-BAS350MX-1","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381478785114,"sku":"BWCS-BAS350MX-2","price":60.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381478817882,"sku":"BWCS-BAS350MX-3","price":67.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BAS350MX-1.webp?v=1778901170","url":"https:\/\/batteryweb.com\/products\/baxter-healthcare-sigma-spectrum-infusion-pumps-replacement-battery-74v-3000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}