{"product_id":"uniwill-u40-replacement-battery-144v-2200mah-li-ion","title":"Uniwill U40 14.4V Replacement Battery U40-3S4400-G1L3","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUniwill U40 — 14.4V Li-ion Replacement Battery (U40-3S4400-G1L3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V, 2200mAh (31.68Wh) lithium-ion battery for the Uniwill U40 notebook. It replaces OEM part numbers U40-3S4400-G1L3, U40-3S4400-C1M1, U40-3S4400-C1H1, U40-3S4000-G1B1, U40-3S4400-S1G1, U40-3S4000-S1S1, 63GU40026-1A, and 63GU40023-3A. Correct fit for U40 units that no longer hold charge or fail to power on without AC connected.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eU40 platform compatibility:\u003c\/strong\u003e\n    All listed OEM part numbers share the same 14.4V three-cell series configuration and connector pinout on the U40 mainboard. The BMS handshake protocol is identical across these variants, so the BIOS accepts this cell without a firmware flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through charge, full-load discharge, and BMS cutoff on a U40 unit. The protection circuit tripped cleanly at low-cell threshold and resumed charging without a reset sequence.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the U40:\u003c\/strong\u003e\n    After installing, run one full discharge until the laptop hibernates, 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 on this platform.\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 immediately after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe U40 BIOS stores charge history and health data from the previous cell in its battery learn registers. When a new cell goes in, that stale EEPROM data makes the BIOS flag the replacement as degraded — even when the cell is brand new. This is not a fault with the battery. Run one full discharge to hibernate-cutoff, then a full uninterrupted charge to 100%. After that cycle, the BIOS relearns the cell and the health warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eU40 shutting down abruptly at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC calibrates its state-of-charge curve against the old cell's impedance profile. With a new cell installed, the reported percentage and actual cell voltage diverge at the lower end of the curve. Under combined CPU and display load, the cell voltage drops below the BMS cutoff threshold before the OS gauge reaches 0% — so the laptop cuts out while the screen still shows 20–30%. Two to three full discharge-and-charge cycles recalibrate the fuel gauge IC against the new cell's actual voltage curve. After calibration, the shutdown will align with the gauge reading near 5%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410844680282,"sku":"BWCS-UNU40NB-1","price":52.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410844713050,"sku":"BWCS-UNU40NB-2","price":61.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410844745818,"sku":"BWCS-UNU40NB-3","price":67.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UNU40NB-big.webp?v=1779581321","url":"https:\/\/batteryweb.com\/products\/uniwill-u40-replacement-battery-144v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}