{"product_id":"toshiba-dynabook-tecra-x50-f-replacement-battery-114v-4050mah-li-polymer","title":"Toshiba Dynabook Tecra X50-F Compatible Battery PA5353U-1BRS 11.4V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eToshiba Dynabook Tecra X50-F Series — 11.4V Li-Polymer Replacement Battery (PA5353U-1BRS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.4V, 4050mAh (46.17Wh) Li-Polymer battery for the Toshiba Dynabook Tecra X50-F series notebook. It replaces the OEM part PA5353U-1BRS and restores cordless operation to the Tecra X50-F, X50-F-11E, X50-F-11F, X50-F-127, and over 19 additional variants. Voltage and connector match the original cell exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTecra X50-F series fit:\u003c\/strong\u003e\n    All X50-F variants share the same 11.4V three-cell Li-Polymer configuration, connector pinout, and BMS handshake protocol. One replacement cell covers the full range 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 a Tecra X50-F unit. The BMS accepted the new cell without error flags, charge current ramped correctly, and the protection circuit triggered at the expected low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the Tecra X50-F:\u003c\/strong\u003e\n    After fitting, run the laptop on battery until it hibernates at cutoff — do not interrupt. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Dynabook firmware.\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 the PA5353U-1BRS\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Dynabook BIOS reads health status from EEPROM data stored in the outgoing cell, not the physical chemistry of the new one. When a replacement cell arrives, the BIOS has no learned baseline yet and flags the battery as poor or unknown. This is a fuel gauge calibration gap, not a fault with the replacement. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% and the BIOS will re-establish its learn cycle. After two to three full cycles, the health indicator will reflect the actual cell state.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTecra X50-F shutting down abruptly 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 discharge curve. The gauge reports 20–30% remaining while the actual cell voltage has already hit the BMS cutoff threshold under CPU and display load. The mismatch between displayed percentage and real voltage causes a sudden shutdown with no low-battery warning. Run a full discharge-to-hibernate cycle, then charge to 100% without interruption — this anchors the fuel gauge IC to the new cell's actual voltage floor and corrects the reading. The cutoff trigger on this cell sits at approximately 9V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409519870042,"sku":"BWCS-TOX500NB-1","price":88.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409519902810,"sku":"BWCS-TOX500NB-2","price":104.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409519935578,"sku":"BWCS-TOX500NB-3","price":115.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TOX500NB-1.webp?v=1779579941","url":"https:\/\/batteryweb.com\/products\/toshiba-dynabook-tecra-x50-f-replacement-battery-114v-4050mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}