{"product_id":"panasonic-cf-sx2jdt2fw-replacement-battery-72v-13600mah-li-ion","title":"Panasonic CF-V25U75R Toughbook Replacement Battery 7.2V 13600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePanasonic CF-SX2 \/ CF-SX3 \/ CF-NX4 Series — 7.2V Li-ion Replacement Battery (CF-VZSU75R)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V, 13600mAh (97.92Wh) Li-ion battery for the Panasonic Toughbook CF-SX2JDT2FW and related CF-SX3, CF-NX4, and CF-SX4 rugged laptops. It matches the OEM voltage rail and connector used across this Toughbook sub-series. Replaces part numbers CF-VZSU75R, CF-VZSU76R, CF-VZSU78R, CF-VZSU79R, and several JS and RR variants.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCF-SX and CF-NX compatibility:\u003c\/strong\u003e\n    These models share the same 7.2V battery bay, BMS handshake protocol, and slide-lock connector. A single cell platform covers the CF-SX2, CF-SX3, CF-NX4, and CF-SX4 without hardware modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on CF-SX series hardware. The BMS communicated correctly with the BIOS — no unknown device flags, no charge refusal, and the fuel gauge IC accepted the new cell data after two calibration cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration on Toughbook:\u003c\/strong\u003e\n    After fitting, run the laptop on battery until it hibernates from low charge — then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the degraded-health warning that appears in Panasonic's battery reporting tool after any 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 Health or Unknown Status After Installing a New Cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe CF-SX BIOS reads health data from EEPROM registers inside the battery controller, not from raw voltage alone. When a new cell goes in, those registers don't yet match the laptop's learned charge profile, so the system flags the battery as degraded or unknown. This is a calibration state, not a fault. Running one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% gives the fuel gauge IC enough data to update its internal model. After two full cycles, BIOS health status on the CF-SX2 and CF-SX3 typically returns to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eToughbook Shuts Down at 20–30% Charge Shown on Screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The reported percentage doesn't reflect the true voltage — the cell hits its low-voltage cutoff before the gauge reaches zero. Under combined CPU and display load, the voltage cliff arrives faster than the estimate predicts, triggering an abrupt shutdown. Run two full discharge-to-hibernate cycles then charge to 100% each time — by the second cycle, the gauge IC recalculates the curve and shutdown at falsely high percentages stops.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409568071770,"sku":"BWCS-PNX200HB-1","price":108.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409568104538,"sku":"BWCS-PNX200HB-2","price":128.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409568137306,"sku":"BWCS-PNX200HB-3","price":142.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PNX200HB-1.webp?v=1779580030","url":"https:\/\/batteryweb.com\/products\/panasonic-cf-sx2jdt2fw-replacement-battery-72v-13600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}