{"product_id":"kennex-420-replacement-battery-111v-4400mah-li-ion","title":"Kennex 420 Laptop Compatible Battery 11.1V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKennex 420 \/ 321 \/ 327 \/ 328 — 11.1V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for the Kennex 420, 321, 327, and 328 notebook series. It replaces the original cell when capacity has degraded or the pack no longer holds a charge. Dimensions are 136.27 x 72.20 x 20.09mm — confirm your original pack matches before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e420 \/ 321 \/ 327 \/ 328 series compatibility:\u003c\/strong\u003e\n    These four Kennex models share the same 11.1V battery bay, connector pinout, and BMS communication protocol. One cell fits all four without 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 Kennex 420 unit. The BMS handshake completed correctly, charge current stepped down at 95% as expected, and the protection circuit tripped cleanly at low-voltage cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on Kennex notebooks:\u003c\/strong\u003e\n    After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a 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 battery health as poor after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Kennex BIOS stores charge history and health data from the previous cell in its battery learn table. When a new cell goes in, that stored data no longer matches the actual chemistry, so the BIOS flags the battery as degraded or unknown. This is a data mismatch, not a fault with the replacement cell. Run two full discharge-to-hibernate and uninterrupted charge cycles — the BIOS relearns the cell and the health warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down with 20–30% still showing on the gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on Kennex notebooks maps percentage readings against voltage curves calibrated to the original cell. After a swap, that map is stale, so the gauge reads 25% while the actual cell voltage has already hit the BMS low-voltage cutoff threshold — typically around 9.0V for a 3S Li-ion pack. The system shuts down because the cell can no longer sustain voltage under combined CPU and display load, even though the gauge hasn't caught up. Complete two full discharge-to-100% charge cycles to let the fuel gauge IC recalibrate against the new cell's actual voltage curve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409819992154,"sku":"BWCS-UNT410NB-1","price":104.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409820024922,"sku":"BWCS-UNT410NB-2","price":118.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409820057690,"sku":"BWCS-UNT410NB-3","price":129.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UNT410NB-1.webp?v=1779581113","url":"https:\/\/batteryweb.com\/products\/kennex-420-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}