{"product_id":"toshiba-tecra-s1-replacement-battery-108v-6600mah-li-ion","title":"Toshiba Tecra S1 Replacement Battery PA3248 10.8V 6600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eToshiba Tecra S1 — 10.8V Li-ion Replacement Battery (PA3248)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 6600mAh Li-ion battery for the Toshiba Tecra S1 business notebook. It replaces OEM part numbers PA3248, PA3248U-1BAS, PA3248U-1BRS, PA3257, PA3257U-1BRS, and PA3257U-1BAS. Dimensions are 144.20 x 90.10 x 20.20mm — verify fitment against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTecra S1 battery bay fitment:\u003c\/strong\u003e\n    Toshiba used the PA3248 and PA3257 part numbers across the same Tecra S1 chassis generation. Both share the same connector pinout, voltage rail, and BMS handshake protocol — this cell covers both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and load on the Tecra S1 platform. The BMS communicated correctly with the system board, accepted a full charge, and held voltage under sustained CPU and display load without tripping a protective cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the Tecra S1:\u003c\/strong\u003e\n    After fitting, run the battery down until the laptop hibernates, then charge uninterrupted to 100%. This forces the Tecra S1 BIOS to complete its battery learn cycle and clears the false \"poor health\" warning that appears 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 battery health as poor after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Tecra S1 BIOS stores learned capacity data from the previous cell in its EEPROM. When a new cell is fitted, that stored data no longer matches, so the system flags the battery as degraded or unhealthy. This is a firmware state, not a fault with the new cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS recalculates and overwrites the old health record.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTecra S1 shutting down at 20–30% charge remaining\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 charge curve. The gauge reports 20–30% remaining, but the cell has already hit its voltage cliff under combined CPU and display load, so the system shuts down to protect the hardware. It is not a faulty battery — it is an uncalibrated gauge. Complete two or three full discharge-to-hibernate then full-charge cycles to bring the fuel gauge into alignment with the new cell's true capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410869354586,"sku":"BWCS-TOS1HB-1","price":72.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410869387354,"sku":"BWCS-TOS1HB-2","price":85.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410869420122,"sku":"BWCS-TOS1HB-3","price":95.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TOS1HB-big.webp?v=1779581417","url":"https:\/\/batteryweb.com\/products\/toshiba-tecra-s1-replacement-battery-108v-6600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}