{"product_id":"toshiba-satellite-c800-replacement-battery-108v-4400mah-li-ion","title":"Toshiba Satellite C800 Replacement Battery PA5023U-1BRS 10.8V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eToshiba Satellite C800 \/ C805 Series — 10.8V Li-ion Replacement Battery (PA5023U-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 Satellite C800, C800D, C805, and C805D series laptops. It replaces OEM part numbers PA5023U-1BRS through PA5027U-1BRS, PABAS259–263, and PA5110U-1BRS. It slots into the same bay as the original and connects via the same multi-pin connector.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSatellite C800 and C805 platform fit:\u003c\/strong\u003e\n    These models share a common battery bay geometry, connector pinout, and BMS communication protocol across the C800, C800D, C805, and C805D variants — that is why one cell covers all of them. The voltage rail and pin assignments are identical across the range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a Satellite C805 and confirmed the BMS handshake completed correctly. The charger recognised the battery, accepted a full charge cycle, and the protection circuit triggered cleanly at low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the C800 series:\u003c\/strong\u003e\n    After fitting, run the laptop on battery until it hibernates at low charge, then plug in and charge to 100% without interruption. 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\"\u003eWhy the Satellite C800 shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Satellite C800's fuel gauge IC builds a charge map against the old cell's wear curve. When a new cell goes in, that map is wrong — the IC thinks the voltage floor is higher than it is. Under full CPU and display load, the laptop sees what it calculates as a critically low state of charge and forces a shutdown. Running one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% lets the IC re-map against the new cell. After two or three cycles, shutdowns at false percentages stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting the replacement battery's Wh rating incorrectly in system info\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eToshiba's BIOS reads Wh data from EEPROM stored in the battery pack, not from live cell measurement. The EEPROM on a replacement cell carries the rated specification at manufacture — 47.52Wh — while the original pack's EEPROM may have written a degraded figure over time. If the BIOS shows a different Wh value than expected, that is an EEPROM mismatch, not a fault with the cell. Check the value under Control Panel → Power Options → Battery details after completing one full calibration cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410739495002,"sku":"BWCS-TOC800NB-1","price":99.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410739527770,"sku":"BWCS-TOC800NB-2","price":112.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410739560538,"sku":"BWCS-TOC800NB-3","price":122.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TOC800NB-1.webp?v=1779581059","url":"https:\/\/batteryweb.com\/products\/toshiba-satellite-c800-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}