{"product_id":"panasonic-fz-40abaacaj-replacement-battery-108v-6200mah-li-polymer","title":"Panasonic FZ-VZSU1XU Toughbook FZ-40 Replacement Battery 10.8V 6200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePanasonic Toughbook FZ-40 — 10.8V Li-Polymer Replacement Battery (FZ-VZSU1XU)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 6200mAh (66.96Wh) Li-Polymer battery replaces the OEM FZ-VZSU1XU cell in the Panasonic Toughbook FZ-40 rugged laptop. It fits the FZ-40ABAACAJ, FZ-40ABAAXAJ, and the broader Toughbook FZ-40 series. Connector pinout and BMS communication protocol match the original cell exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFZ-40 series compatibility:\u003c\/strong\u003e\n    The FZ-40ABAACAJ and FZ-40ABAAXAJ variants share the same 10.8V power rail, bay dimensions, and SMBus BMS handshake. One cell fits both SKUs without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the FZ-40 platform. The BMS completed full SMBus authentication, reported correct Wh rating to the OS, and held voltage under combined CPU and display load without triggering premature cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the FZ-40:\u003c\/strong\u003e\n    After fitting this battery, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting poor battery health immediately after swap on the FZ-40\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Toughbook FZ-40 BIOS reads health data stored in the old cell's EEPROM and compares it against cycle history. When a new cell arrives, the EEPROM data is either blank or mismatched, so the BIOS flags it as degraded before a single cycle runs. This is a calibration state, not a defect. Run one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100%. After that learn cycle, the BIOS updates its fuel gauge IC reference and clears the false health warning.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFZ-40 shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below the BMS cutoff threshold under load before the fuel gauge IC shows empty — a voltage cliff caused by a degraded or uncalibrated cell. A new, uncalibrated cell can trigger the same symptom because the OS fuel gauge IC hasn't mapped the new cell's discharge curve yet. The fix is the same calibration cycle: discharge fully to hibernate, then charge to 100% without interruption. After two or three full cycles, the fuel gauge IC builds an accurate model and shutdowns at 20–30% stop occurring.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409514332250,"sku":"BWCS-PNZ410NB-1","price":223.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409514365018,"sku":"BWCS-PNZ410NB-2","price":267.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409514397786,"sku":"BWCS-PNZ410NB-3","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PNZ410NB_1.webp?v=1779579871","url":"https:\/\/batteryweb.com\/products\/panasonic-fz-40abaacaj-replacement-battery-108v-6200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}