{"product_id":"nellcor-puritan-bennett-n-550b-pulse-oximeter-replacement-battery-96v-3800mah-ni-mh","title":"Nellcor Puritan Bennett N-550B Replacement Battery 9.6V 3800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNellcor Puritan Bennett N-550B \/ N-560 Pulse Oximeter — 9.6V Ni-MH Replacement Battery (BPANEN560)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 9.6V 3800mAh Ni-MH battery replaces the original power cell in the Nellcor Puritan Bennett N-550B and N-560 pulse oximeters. Both units share the same battery bay dimensions, connector pinout, and BMS handshake protocol, making this a direct fit across the N-550B and N-560 platforms. Capacity is 3800mAh (36.48Wh) — confirmed from product specification data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eN-550B and N-560 platform compatibility:\u003c\/strong\u003e\n    Both oximeter models run the same 9.6V battery rail, use an identical multi-pin connector, and negotiate with the same charge controller IC. One battery part number — BPANEN560 — covers both units because the electrical and mechanical interface is unchanged between them.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the N-550B charge controller and confirmed the BMS accepted the new cell without a chemistry mismatch fault. The charge IC completed a full taper charge without cutting off early, and the self-test passed on the second boot after a complete charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup protocol:\u003c\/strong\u003e\n    After installing this battery, do not interrupt the device's power-on self-test. The N-550B runs a BMS verification routine at startup — cutting power during that sequence triggers a persistent battery fault flag that clears only on a full reboot. Let the unit complete its boot cycle fully before clinical use.\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-550B shows a low battery alarm immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe N-550B's charge controller was calibrated to the discharge curve of the OEM Ni-MH cell. A new replacement cell has a slightly different internal resistance profile in its first few cycles, which causes the BMS to read the voltage as lower than actual state-of-charge. The device treats this as a fault condition and triggers the alarm before the battery has had a chance to condition its cells. Run one complete charge-discharge cycle — down to automatic cutoff, then back to full — and the BMS recalibrates its threshold to the new cell. The alarm clears after that first conditioning cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eN-560 will not power on after the battery sat unused in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–2% per day. A battery stored for several months can drop below the BMS recovery threshold — typically around 8.4V on a 9.6V pack — at which point the device's protection circuit blocks power delivery entirely to prevent cell damage. The N-560 will appear completely dead even though the battery is not faulty. Connect the charger and leave it for a minimum of 2–3 hours before attempting to power on. If the charge indicator does not respond within 30 minutes, verify the charger is outputting voltage at the connector — the unit will not boot until the pack climbs above the BMS recovery floor.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381499854938,"sku":"BWCS-NPT550MD-1","price":73.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381499887706,"sku":"BWCS-NPT550MD-2","price":86.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381499920474,"sku":"BWCS-NPT550MD-3","price":95.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NPT550MD-1.webp?v=1778901266","url":"https:\/\/batteryweb.com\/products\/nellcor-puritan-bennett-n-550b-pulse-oximeter-replacement-battery-96v-3800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}