{"product_id":"toshiba-satellite-c40-ad05b1-replacement-battery-108v-4400mah-li-ion","title":"Toshiba Satellite C40 Replacement Battery 10.8V 4400mAh PA5108U","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eToshiba Satellite C40 Series — 10.8V Li-ion Replacement Battery (PA5108U-1BRS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 4400mAh (47.52Wh) Li-ion battery for the Toshiba Satellite C40 series notebook. It fits the C40-AD05B1, C40-AT15B1, C40-AS20W1, C40-AT19W1, and over two dozen additional C40 variants. OEM cross-references include PA5108U-1BRS, PA5109U-1BRS, PA5110U-1BRS, PABAS271, PABAS272, and PABAS273.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC40 series compatibility:\u003c\/strong\u003e\n    All covered models share the same 10.8V rail, identical connector pinout, and a common BMS communication protocol. Toshiba used this same battery housing across the C40 lineup regardless of regional suffix — the AD05B1, AT15B1, AS20W1, and AT19W1 all pull from this same pack specification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a C40-series board and confirmed the BMS handshake completes correctly. The charge controller accepted the pack without fault codes, and voltage held steady through a full charge cycle with no thermal interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle conditioning on C40 hardware:\u003c\/strong\u003e\n    After installing, run the laptop down to hibernate cutoff on battery only — no AC — then charge it uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity curve 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\"\u003eBIOS reporting poor battery health immediately after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Satellite C40 BIOS reads health data from the battery's EEPROM, not from live voltage measurements. When a new cell arrives, its EEPROM contains factory-default data that the BIOS has never seen before, so it flags the pack as unknown or degraded. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% allows the BIOS learn cycle to write fresh data against the new cell. After one or two calibration cycles, the health indicator will update to reflect actual capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down abruptly at 20–30% charge shown\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis symptom appears when the fuel gauge IC hasn't yet calibrated against the new cell's voltage curve. The gauge shows 25% remaining, but the cell voltage is already hitting the BMS low-voltage cutoff under the combined load of the CPU, display, and storage. The old cell's discharge profile was mapped in firmware — the new cell needs a fresh reference point. Run two complete discharge cycles to hibernate cutoff with the screen at full brightness and a CPU load active, then recharge fully each time. After the second cycle, the gauge readout and actual cutoff voltage should align to within a few percent.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409754882138,"sku":"BWCS-TOC400NB-1","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409754914906,"sku":"BWCS-TOC400NB-2","price":83.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409754947674,"sku":"BWCS-TOC400NB-3","price":92.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TOC400NB-1.webp?v=1779580734","url":"https:\/\/batteryweb.com\/products\/toshiba-satellite-c40-ad05b1-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}