{"product_id":"hasee-cnv4s02-replacement-battery-152v-3050mah-li-ion","title":"Hasee CNV4S02 Replacement Battery 15.2V 3050mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHasee CNV4S02 \/ S7-2021S7 — 15.2V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 15.2V, 3050mAh (46.36Wh) Li-ion battery for Hasee notebook models CNV4S02 and S7-2021S7. It replaces the original internal cell when the laptop no longer holds a charge or fails to power on from battery alone. Voltage and connector match the original specification on both supported models.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCNV4S02 and S7-2021S7 compatibility:\u003c\/strong\u003e\n    Both models run the same 15.2V four-cell Li-ion architecture with identical BMS handshake requirements and connector pinout. One battery covers both variants without any hardware modification.\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 discharge on a compatible Hasee unit. The BMS accepted the new cell without error flags, and the protection circuit responded correctly to both overvoltage cutoff and undervoltage protection thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration cycle:\u003c\/strong\u003e\n    After fitting this battery, discharge the laptop fully until it hibernates on its own — do not force shutdown — then charge it uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that typically appears after any 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\"\u003eWhy the CNV4S02 shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe BIOS fuel gauge IC was calibrated against the old cell's discharge curve. When a new cell goes in, the IC still uses the stored curve, which no longer matches actual cell voltage under load. Under full CPU and display load, the real cell voltage drops faster than the gauge expects, triggering a low-voltage shutdown well above the displayed percentage. One complete discharge-to-hibernate followed by an uninterrupted full charge forces the IC to relearn the new cell's curve and corrects the early cutoff behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as poor or unknown straight after fitting\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the BIOS reads health data from EEPROM registers that were written by the original cell over its lifespan. A new cell arrives with fresh EEPROM data that does not match the degraded values the BIOS was expecting, so it flags the result as unknown or poor. It is not a fault with the replacement cell. Run two full calibration cycles — full discharge to hibernate, then charge to 100% uninterrupted — and the BIOS health reading will update to reflect the actual state of the new cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409538252890,"sku":"BWCS-CLN400NB-1","price":91.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409538285658,"sku":"BWCS-CLN400NB-2","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409538318426,"sku":"BWCS-CLN400NB-3","price":119.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CLN400NB-1.webp?v=1779579965","url":"https:\/\/batteryweb.com\/products\/hasee-cnv4s02-replacement-battery-152v-3050mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}