{"product_id":"tongfang-gk5cq7z-replacement-battery-152v-4000mah-li-polymer","title":"Tongfang GK5CQ7Z Laptop Compatible Battery 15.2V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTongfang GK5CQ7Z \/ GM7MG0R \/ UMI Pro Series — 15.2V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 15.2V, 4000mAh (60.8Wh) Li-Polymer battery replaces the internal cell in Tongfang GK5CQ7Z, GM7MG0R, GM7PG0R, and UMI Pro2\/Pro3 GM5 laptops. It restores charge capability when the original cell can no longer hold a usable charge. Voltage and connector match the OEM spec on this notebook platform.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGK5CQ7Z \/ GM7 \/ UMI Pro platform fit:\u003c\/strong\u003e\n    These notebooks share a 15.2V four-cell Li-Polymer architecture with the same physical connector and BMS handshake protocol. One replacement cell covers all listed models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge and discharge cycles through a controlled load, monitoring BMS cutoff thresholds. The protection circuit triggered correctly at both over-voltage and under-voltage limits, and charge acceptance matched rated capacity.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on GK5CQ7Z:\u003c\/strong\u003e\n    After fitting, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell 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\"\u003eLaptop shutting down at 20–30% shown after battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell installed in the GK5CQ7Z can trigger unexpected shutdowns while the OS still shows 20–30% remaining. The fuel gauge IC is still reading curve data calibrated to the old, degraded cell. Under full CPU plus display load, voltage drops faster than the IC expects, and the system hits the hardware cutoff before the gauge catches up. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100% — after that, the gauge tracks the actual cell curve and shutdowns at false percentages stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery Wh rating as wrong after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome users see the BIOS report a Wh figure that does not match the 60.8Wh spec on this battery. The BIOS reads Wh from EEPROM data embedded in the cell's protection board, and that value reflects the rated chemistry spec rather than a real-time measurement. This is a firmware display issue, not a capacity fault. Confirm the physical spec is 15.2V × 4000mAh = 60.8Wh — if those values match, the cell is correct and no further action is needed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409534812250,"sku":"BWCS-MDX200NB-1","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409534845018,"sku":"BWCS-MDX200NB-2","price":68.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409534877786,"sku":"BWCS-MDX200NB-3","price":75.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MDX200NB-1.webp?v=1779579987","url":"https:\/\/batteryweb.com\/products\/tongfang-gk5cq7z-replacement-battery-152v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}