{"product_id":"hasee-z7-i7-8172-r2-replacement-battery-148v-4000mah-li-ion","title":"Hasee Z7-I7 8172 R2 Replacement Battery 14.8V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHasee Z7-I7 8172 R2 \/ Z8-KL7S2 Series — 14.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.8V, 4000mAh (59.2Wh) Li-ion replacement battery for the Hasee Z7-I7 8172 R2 and its sibling models including the Z8-KL7S2, Z7-KP7G1, and Z7M-KP5DC. It targets the original cell directly when the factory battery degrades, stops holding charge, or fails to register with the BIOS. Dimensions are 221.64 x 99.10 x 15.10mm — verify this against your bay before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eZ7 and Z8 series compatibility:\u003c\/strong\u003e\n    These Hasee gaming notebook lines share the same 14.8V four-cell architecture and battery connector pinout. The BMS handshake protocol and charge controller expectations are consistent across the Z7 and Z8 variants listed, which is why a single cell covers the full range.\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 compatible hardware, confirmed the BMS completed a full charge handshake without throwing a fault, and verified the protection circuit tripped correctly at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the Z7-I7:\u003c\/strong\u003e\n    After installation, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100% without using the machine. This forces the BIOS battery learn cycle to reset against the new cell chemistry and clears the inaccurate health warning that appears after every battery swap 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 poor battery health immediately after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Hasee Z7-I7 BIOS stores battery health data in EEPROM tied to the original cell's charge history. When a new cell is fitted, that stored data does not match the fresh cell, so the BIOS flags it as degraded before a single cycle has run. This is not a fault with the replacement cell — it is a mismatch between old EEPROM records and the new cell's actual state. Running one full discharge-to-hibernate followed by a complete uninterrupted charge clears this and lets the firmware re-learn against the new chemistry. After two to three full cycles the health indicator normalises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down hard at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The old calibration data predicts 20–30% remaining but the actual cell voltage has already dropped below the CPU and display load threshold — the system cuts out to protect hardware. It is not a defective battery. Run two full discharge cycles to hibernate cutoff, charging fully between each — the fuel gauge IC re-maps the voltage-to-percentage curve against the new cell. After calibration, the gauge tracks accurately and the shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409677615194,"sku":"BWCS-CLP650NB-1","price":90.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409677647962,"sku":"BWCS-CLP650NB-2","price":106.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409677680730,"sku":"BWCS-CLP650NB-3","price":117.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CLP650NB-1.webp?v=1779580400","url":"https:\/\/batteryweb.com\/products\/hasee-z7-i7-8172-r2-replacement-battery-148v-4000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}