{"product_id":"casper-tw8-replacement-battery-111v-4400mah-li-ion","title":"Casper TW8 Replacement Battery SQU-805 11.1V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCasper TW8 — 11.1V Li-ion Replacement Battery (SQU-805)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V 4400mAh Li-ion replacement battery for the Casper TW8 notebook. It replaces the original cell when capacity has degraded to the point where the laptop no longer holds a useful charge away from the wall. Fits models listed under OEM part numbers SQU-805, SQU-804, SQU-807, and SW8-3S4400-B1B1 among others.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTW8 platform compatibility:\u003c\/strong\u003e\n    The TW8 series uses a shared battery bay and connector across variants covered by the SQU-80x family. The BMS handshake voltage and connector pinout are consistent across these part numbers, which is why multiple OEM codes map to the same physical cell pack.\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 cycles on the TW8 platform. The BMS communicated correctly with the system board, charge acceptance was normal from the first cycle, and no overcurrent trips occurred under sustained CPU and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the TW8:\u003c\/strong\u003e\n    After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100% without interrupting it. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after most cell swaps 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 battery health as poor after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe TW8 BIOS reads health data stored in the battery's EEPROM. When a new cell arrives, that EEPROM data does not yet match what the system expects from a calibrated pack. The BIOS interprets this mismatch as degraded health even though the cell is new. Running one full discharge-to-hibernate then a full uninterrupted charge cycle allows the firmware to rewrite its learned capacity baseline and clears the warning on next boot.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTW8 shutting down abruptly at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below what the system board will sustain under combined CPU and display load, even though the fuel gauge still reads above zero. The gauge IC is calibrated against the old cell's discharge curve, so it overestimates remaining charge at the voltage cliff. After two or three full calibration cycles, the fuel gauge IC recalibrates against the new cell's actual curve. Shutdowns should stop once the gauge tracks the new cell accurately — typically by the third full cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409822416986,"sku":"BWCS-FQU804NB-1","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409822449754,"sku":"BWCS-FQU804NB-2","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409822482522,"sku":"BWCS-FQU804NB-3","price":118.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/batteryweb.com\/products\/casper-tw8-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}