{"product_id":"cjscope-qx-350-rx-replacement-battery-108v-4200mah-li-ion","title":"Cjscope QX-350 RX Replacement Battery 10.8V 4200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCjscope QX-350 RX — 10.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 4200mAh (45.36Wh) Li-ion battery replaces the original cell in the Cjscope QX-350 RX laptop. It restores untethered operation when the factory battery no longer holds a charge. Voltage and connector match the QX-350 RX battery bay exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQX-350 RX platform fit:\u003c\/strong\u003e\n    The QX-350 RX uses a 10.8V three-cell Li-ion pack. Any replacement must match that voltage rail and the BMS communication protocol the system board expects — a mismatch trips a charge block at the firmware level before the first cycle completes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, full-load discharge, and BMS handshake verification. The protection circuit responded correctly to over-current and cell-level voltage drop — no false cutoffs under sustained CPU and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration after install:\u003c\/strong\u003e\n    After fitting, run the laptop on battery until it hibernates from low charge, then charge uninterrupted to 100% without interruption. This forces the fuel gauge IC to re-learn the new cell's actual capacity and clears the inaccurate health warning the BIOS displays 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 QX-350 RX BIOS flags a new battery as poor health\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe QX-350 RX stores battery health data in EEPROM on the system board — not on the battery itself. When a new cell goes in, that stored data still reflects the worn-out original. The BIOS reads the old EEPROM values and reports poor health even though the cell is fresh. Running a full discharge-to-hibernate then a complete uninterrupted charge forces a battery learn cycle, overwrites the stale EEPROM data, and brings the health indicator back to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down with 20–30% charge still showing on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual voltage curve. The gauge is reading a percentage mapped to the old battery — when the new cell hits its real voltage floor under load, the system cuts power before the displayed number reaches zero. The fix is two to three full calibration cycles: discharge to hibernate cutoff each time, then charge fully to 100%. After those cycles, the displayed percentage and actual remaining capacity will track each other accurately down to the correct shutdown voltage of around 9.0V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409683087450,"sku":"BWCS-CLB500NB-1","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409683120218,"sku":"BWCS-CLB500NB-2","price":90.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409683152986,"sku":"BWCS-CLB500NB-3","price":101.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CLB500NB-1.webp?v=1779580399","url":"https:\/\/batteryweb.com\/products\/cjscope-qx-350-rx-replacement-battery-108v-4200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}