{"product_id":"toshiba-tecra-a3x-165-replacement-battery-108v-4400mah-li-ion","title":"Toshiba Tecra A3X-165 Compatible Battery 10.8V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eToshiba Tecra A3X-165 \/ M9 Series — 10.8V Li-ion Replacement Battery (PA3356U-1BRS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 4400mAh (47.52Wh) Li-ion replacement battery for the Toshiba Tecra A3X-165 and Tecra M9 series business notebooks. It also fits the Dynabook Qosmio F20 and over 170 additional Toshiba models sharing the same connector and voltage rail. OEM cross-references include PA3356U-1BRS, PABAS071, PABAS048, and PA3588U-1BRS among others.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTecra A3X and M9 platform compatibility:\u003c\/strong\u003e\n    These models share a common 10.8V three-cell Li-ion architecture, identical connector pinout, and the same BMS handshake protocol — which is why a single cell works across the full Tecra A3 and M9 range without firmware modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a Tecra M9 chassis and confirmed the BMS negotiated charge cycles correctly, accepted a full charge to 47.52Wh, and passed voltage-under-load checks at both idle and peak CPU draw without triggering a cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on Tecra models:\u003c\/strong\u003e\n    After installing, run one full discharge until the laptop hibernates at cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health or \"unknown battery\" warning that commonly appears after every cell swap on this platform.\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  \u003cp class=\"bpw-desc-p\"\u003eThe Tecra BIOS reads health data stored in the battery's EEPROM and compares it against its internal baseline from the previous cell. A brand-new cell carries factory EEPROM values that don't match the BIOS's learned profile, triggering a false \"degraded\" or \"poor health\" flag. This is not a fault with the replacement cell. Run a single full discharge-to-hibernate followed by an uninterrupted charge to 100% — the BIOS resets its learn cycle and the warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTecra A3X shutting 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 OS reads a percentage based on the old cell's profile, but the new cell hits its lower voltage cliff at a different point — the laptop cuts power before the gauge reaches zero. It looks like a faulty battery but is a calibration mismatch. Complete two full discharge-to-hibernate and full-charge cycles; the fuel gauge IC recalibrates and shutdowns stop occurring above approximately 10.8V cutoff.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410870534234,"sku":"BWCS-TOM500NB-1","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410870567002,"sku":"BWCS-TOM500NB-2","price":82.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410870599770,"sku":"BWCS-TOM500NB-3","price":91.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TOM500NB-1.webp?v=1779581417","url":"https:\/\/batteryweb.com\/products\/toshiba-tecra-a3x-165-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}