{"product_id":"toshiba-dynabook-satellite-b450b-replacement-battery-108v-4400mah-li-ion","title":"Toshiba Dynabook Satellite B450\/B Replacement Battery PA3788U-1BRS 10.8V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eToshiba Dynabook Satellite B450\/B Series — 10.8V Li-ion Replacement Battery (PA3788U-1BRS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 4400mAh (47.52Wh) lithium-ion battery for the Toshiba Dynabook Satellite B450\/B and related B-series business notebooks. It cross-references OEM part numbers PA3788U-1BRS, PABAS223, PA3787U-1BRS, and PABAS221. The physical dimensions are 206.90 × 45.00 × 20.10mm — confirm your bay size before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eB450\/B, B452\/F, B550\/B, B551\/E shared platform:\u003c\/strong\u003e\n    These Dynabook B-series models run the same 10.8V battery rail, use an identical multi-pin connector, and share the same BMS handshake protocol — which is why one part number covers the full range.\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 on a B-series unit. The BMS initialised correctly, reported cell voltage within expected range, and the protection circuit tripped cleanly at low-voltage cutoff without false-positive shutdowns.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on Dynabook B-series:\u003c\/strong\u003e\n    After fitting, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that frequently appears after a cell swap on these models.\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 after replacement on Dynabook B-series\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Dynabook B450\/B BIOS reads health data stored in the battery's EEPROM. When a new cell is installed, the EEPROM data doesn't match the BIOS's learned history from the old pack, so it flags the battery as degraded or unknown. This is a calibration state, not a hardware fault. One complete discharge-to-hibernate followed by an uninterrupted full charge gives the BIOS enough data to re-learn the new cell and clear the warning.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts 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 hasn't been calibrated against the new cell yet. The gauge miscalculates remaining capacity, and the laptop cuts power before the true low-voltage threshold is reached. It's not a faulty battery — it's the IC working from stale reference data. Run two full discharge-to-hibernate and full recharge cycles, then verify the laptop reaches shutdown no earlier than 5–7% indicated charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409806688346,"sku":"BWCS-TOB450NB-1","price":99.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409806721114,"sku":"BWCS-TOB450NB-2","price":113.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409806753882,"sku":"BWCS-TOB450NB-3","price":123.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TOB450NB-1.webp?v=1779580993","url":"https:\/\/batteryweb.com\/products\/toshiba-dynabook-satellite-b450b-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}