{"product_id":"nihon-kohden-bsm-4000-replacement-battery-12v-3000mah-ni-mh","title":"Nihon Kohden NKB-101 BSM-4000 Replacement Battery 12V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNihon Kohden BSM-4000 \/ TEC 825 Series — 12V Ni-MH Replacement Battery (NKB-101)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 12V 3000mAh (36Wh) Ni-MH battery replaces the NKB-101 and compatible part numbers in the Nihon Kohden BSM-4000 and BSM-5100 bedside patient monitors, as well as the TEC 825 and TEC8250 defibrillators. It restores portable operation for patient transport and covers against mains interruption. Dimensions are 141.55 × 97.60 × 29.86mm — match these before installation in your unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCross-platform fit — monitors and defibrillators:\u003c\/strong\u003e\n    The BSM-4000, BSM-5100, TEC 825, and TEC8250 share a common 12V battery bay and connector spec. The BMS handshake protocol is consistent across this Nihon Kohden platform, which is why one cell covers both monitoring and defibrillation hardware.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and load discharge on the BSM-4000 platform. The BMS accepted the cell without fault on the first full charge cycle. Voltage held steady at 12V nominal under the monitor's continuous ECG and SpO₂ load profile.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the BSM-4000 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this window logs a false battery fault that persists 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 BSM-4000 alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe BSM-4000's charge IC applies a conservative acceptance threshold calibrated to a conditioned OEM cell. A new Ni-MH cell that has not completed its first full charge-discharge cycle presents a slightly different internal resistance profile than a broken-in cell. The monitor's BMS reads this as insufficient capacity and triggers the low-battery alarm even when the cell is at full state of charge. Run one complete charge-to-discharge cycle before treating any alarm as a fault. After that cycle, the BMS recalibrates its threshold to the new cell's actual resistance curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBSM-4000 will not power on after battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells self-discharge at roughly 1–2% per day at room temperature. A cell stored for several months can drop below the BSM-4000's BMS recovery threshold — typically around 10V on a 12V pack — and the monitor will refuse to boot rather than risk a mid-session cutoff. Connect the battery to the monitor on mains power and leave it on charge for a full uninterrupted cycle. If the charge indicator does not advance after 30 minutes, the cell voltage may be below the charger's kick-start floor; some charge ICs require the pack to be at or above 10.5V before the charge sequence initiates.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381441495130,"sku":"BWCS-NKB400MD-1","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381441527898,"sku":"BWCS-NKB400MD-2","price":126.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381441560666,"sku":"BWCS-NKB400MD-3","price":140.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKB400MD-1.webp?v=1778900852","url":"https:\/\/batteryweb.com\/products\/nihon-kohden-bsm-4000-replacement-battery-12v-3000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}