{"product_id":"panasonic-cf-u1-replacement-battery-74v-3200mah-li-ion","title":"CF-VZSU53W Panasonic Toughbook CF-U1 Compatible Battery 7.4V 3200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePanasonic CF-U1 \/ CF-H1 Toughbook — 7.4V Li-ion Replacement Battery (CF-VZSU53W)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 3200mAh Li-ion replacement battery for the Panasonic Toughbook CF-U1 and CF-H1 ultraportable field computers. It cross-references OEM part numbers CF-VZSU53W, CF-VZSU53JS, and CF-VZSU53AW. Capacity is 23.68Wh, matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCF-U1 and CF-H1 compatibility:\u003c\/strong\u003e\n    Both models share the same 7.4V battery bay, connector pinout, and BMS communication protocol — one cell fits both. The SMBus handshake is identical across the CF-U1 and CF-H1 production runs, so the BIOS recognises this cell without firmware flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a CF-U1 unit through charge, full load discharge, and BMS cutoff. The protection circuit triggered cleanly at the low-voltage threshold, and charge acceptance held steady across three consecutive cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the CF-U1:\u003c\/strong\u003e\n    After fitting, run the battery down to hibernate cutoff under normal use — screen on, CPU active — 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 fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe CF-U1 BIOS reads health data from the battery's EEPROM, which stores cycle count and state-of-health values written by the original cell. A new cell arrives with factory EEPROM data that does not match the host system's learned parameters. Until a full discharge-to-cutoff and uninterrupted recharge cycle is completed, the BIOS treats the cell as degraded. After one full learn cycle, the health indicator resets to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCF-U1 shutting down at 25–30% battery shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a fuel gauge calibration issue, not a faulty cell. The fuel gauge IC on the CF-U1 uses a coulomb-counting model calibrated to the old cell's discharge curve. When a new cell is installed, the stored curve no longer matches actual cell chemistry, so the gauge calls empty too early. Run two to three full discharge-to-hibernate cycles without interruption. By the third cycle the gauge IC recalculates its empty threshold and the shutdown point corrects to below 5% shown.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409806491738,"sku":"BWCS-CRH10NB-1","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409806524506,"sku":"BWCS-CRH10NB-2","price":82.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409806557274,"sku":"BWCS-CRH10NB-3","price":92.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CRH10NB-1.webp?v=1779580971","url":"https:\/\/batteryweb.com\/products\/panasonic-cf-u1-replacement-battery-74v-3200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}