{"product_id":"emachines-d442-replacement-battery-111v-4400mah-li-ion","title":"eMachines D442 Replacement Battery 11.1V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eeMachines D442 \/ E440 Series — 11.1V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V 4400mAh (48.84Wh) lithium-ion battery replaces the original pack in eMachines D442, D528, E440, and E442 laptops. It fits the standard battery bay and connects via the same multi-pin connector used across this notebook series. Voltage and connector pinout match the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eD442 \/ E440 series compatibility:\u003c\/strong\u003e\n    These models share the same 11.1V battery bay, connector layout, and BMS communication protocol. One cell pack covers the full set — no adapter or wiring change needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on an eMachines E442. The BMS handshake completed correctly, charge termination triggered at the expected cutoff voltage, and the OS fuel gauge registered the cell without error flags after two calibration cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on eMachines BIOS:\u003c\/strong\u003e\n    After installing, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle 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 eMachines BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's charge curve. A brand-new cell does not match that stored profile, so the BIOS flags it as degraded. This is a data mismatch, not a fault with the replacement cell. Run the full discharge-to-hibernate then uninterrupted charge cycle once, and the BIOS learn routine will write new baseline data to match the installed cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts off abruptly 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 actual voltage curve. The OS shows 25% remaining, but the cell voltage has already dropped below the BMS cutoff threshold under combined CPU and display load. The gauge and the real state of charge are out of sync. Complete two full discharge-to-100% charge cycles and the fuel gauge IC will recalibrate — the cutoff should align with a displayed level below 5%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410789564506,"sku":"BWCS-AC4551NB-1","price":101.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410789597274,"sku":"BWCS-AC4551NB-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410789630042,"sku":"BWCS-AC4551NB-3","price":127.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AC4551NB-1.webp?v=1779581091","url":"https:\/\/batteryweb.com\/products\/emachines-d442-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}