{"product_id":"founder-frnx916kkd-replacement-battery-111v-4400mah-li-ion","title":"Founder FRNX916K\/KD Laptop Compatible Battery 11.1V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFounder FRNX916K\/KD — 11.1V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V, 4400mAh (48.84Wh) lithium-ion battery for the Founder FRNX916K and FRNX916KD notebooks. It slots into the original battery bay and connects to the same three-cell series configuration the BIOS expects. No OEM part number exists for this unit — fitment is confirmed against the FRNX916K\/KD chassis only.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFRNX916K and FRNX916KD compatibility:\u003c\/strong\u003e\n    Both variants share the same battery bay dimensions, connector pinout, and 11.1V nominal voltage rail. The BMS in each chassis communicates over the same SMBus protocol, so the same cell pack satisfies both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, idle draw, and sustained CPU load. The BMS negotiated correctly at each stage — no false over-voltage cutoff, no mid-discharge trip under load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the FRNX916K\/KD:\u003c\/strong\u003e\n    After installation, run the laptop down to hibernate cutoff under normal use, 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\"\u003eBIOS reporting poor battery health immediately after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe FRNX916K\/KD BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's output profile. On first boot with a fresh cell, those figures don't match, so the BIOS flags the battery as degraded or unknown. This is a data mismatch, not a fault. Run one complete discharge-to-hibernate cycle followed by a full uninterrupted charge. After that cycle, the BIOS learn routine overwrites the cached EEPROM baseline and the health flag clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop cuts out at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't yet calibrated its state-of-charge map against the new cell chemistry. The gauge reports 25% remaining, but the actual cell voltage is already at the BMS cutoff threshold — the laptop shuts down before the display reaches 0%. The fix is two to three full discharge-to-100% cycles without interruption. After calibration, the fuel gauge tracks actual cell voltage accurately and shutdowns at low charge stop. Target a resting cell voltage of 12.4–12.6V at a full charge reading to confirm calibration has settled.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409818222682,"sku":"BWCS-CLM450NB-1","price":104.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409818255450,"sku":"BWCS-CLM450NB-2","price":118.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409818288218,"sku":"BWCS-CLM450NB-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CLM450NB-1.webp?v=1779581092","url":"https:\/\/batteryweb.com\/products\/founder-frnx916kkd-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}