{"product_id":"huawei-honor-v8-replacement-battery-38v-3400mah-li-polymer","title":"Huawei Honor V8 HB376787ECW Replacement Battery 3.8V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHuawei Honor V8 — 3.8V Li-Polymer Replacement Battery (HB376787ECW)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe HB376787ECW is a 3.8V, 3400mAh lithium-polymer cell that fits the Honor V8 and Honor V8 Premium (KNT-AL20, KNT-AL10). It replaces the original battery when the existing cell has degraded through charge cycles and can no longer hold a stable voltage under load. Capacity is 12.92Wh, matching the factory specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHonor V8 and V8 Premium fit:\u003c\/strong\u003e\n    Both variants — KNT-AL20 and KNT-AL10 — use the same 3.8V cell with identical connector pitch and BMS handshake. One cell covers both boards without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the HB376787ECW through a full charge cycle and monitored BMS communication. The protection circuit tripped correctly at the low-voltage cutoff and accepted charge current without error flags on the charge IC.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins. Skipping this step causes the percentage display to drift during early cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Honor V8 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh lithium-polymer cell has a steeper voltage cliff than a broken-in cell. When the modem transmits or the display peaks brightness, the instantaneous current draw pulls the terminal voltage below the BMS cutoff — even if the coulomb counter still shows 25%. The phone shuts down to protect the cell, not because charge is actually gone. One full discharge-to-empty and uninterrupted charge cycle lets the fuel gauge IC recalibrate its internal model against the real discharge curve of the new cell, and shutdowns at mid-percentage typically stop after that first cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not accepted on the first cycle after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eHuawei's proprietary fast charge protocol requires the charge IC and BMS to negotiate current limits before stepping up from 5V standard charge. On a freshly installed cell, the BMS may reject the elevated current on the first handshake and fall back to 5W standard charging. This is a safety default, not a fault with the cell. Charge the phone once at standard rate until full, then reconnect with the original Huawei fast charger — the BMS handshake completes correctly on the second cycle once the cell voltage is within the expected window.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392075366490,"sku":"BWCS-HUV800SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392075399258,"sku":"BWCS-HUV800SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392075432026,"sku":"BWCS-HUV800SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HUV800SL-1.webp?v=1779143621","url":"https:\/\/batteryweb.com\/products\/huawei-honor-v8-replacement-battery-38v-3400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}