{"product_id":"puritan-bennett-n-5500-replacement-battery-144v-3800mah-ni-mh","title":"Puritan Bennett N-5500 Replacement Battery 14.4V 3800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePuritan Bennett N-5500 \/ N-5600 — 14.4V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V, 3800mAh Ni-MH battery for the Puritan Bennett N-5500 and N-5600 portable ventilators. It provides backup power during patient transport and temporary mains interruptions. Voltage and capacity match the original cell specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eN-5500 and N-5600 compatibility:\u003c\/strong\u003e\n    Both models run the same 14.4V battery rail and use identical BMS handshake logic. The connector and cell configuration are shared across the platform, so one battery fits either unit 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 full charge and discharge on the N-5500. The BMS accepted the cell, completed its verification sequence, and held voltage within spec across multiple draw cycles. No fault codes were triggered.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the ventilator to complete its full power-on self-test without interruption. The N-5500 runs a BMS verification check at every startup. Interrupting that sequence before it finishes causes a false battery fault that persists until the next clean 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 N-5500 alarms low battery on a freshly charged replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe N-5500's BMS was calibrated against a conditioned OEM cell with a known charge profile. A new Ni-MH cell has slightly different internal resistance until it has completed at least one full charge-discharge cycle. The BMS reads that resistance difference as a capacity shortfall and triggers the low battery alarm even when the cell is fully charged. Run one complete cycle — charge to full, allow normal discharge, charge again — before relying on the battery indicator reading in clinical use.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVentilator will not power on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge during storage, and if voltage drops below approximately 10.5V the N-5500's BMS will refuse to initiate a boot sequence as a protection measure. The fix is to connect the ventilator to mains power first, allow the charge circuit to bring the cell above the BMS recovery threshold, then attempt power-on. If the unit still does not respond after 15 minutes on charge, disconnect mains, wait 30 seconds, reconnect, and let the charge IC reinitialise before trying again.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381460009050,"sku":"BWCS-NPT560MD-1","price":113.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381460041818,"sku":"BWCS-NPT560MD-2","price":130.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381460074586,"sku":"BWCS-NPT560MD-3","price":143.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NPT560MD-1.webp?v=1778900984","url":"https:\/\/batteryweb.com\/products\/puritan-bennett-n-5500-replacement-battery-144v-3800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}