{"product_id":"htc-u11-replacement-battery-385v-3800mah-li-polymer","title":"HTC U11+ Replacement Battery 3.85V 3800mAh 35H00277-00M","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHTC U11+ — 3.85V Li-Polymer Replacement Battery (35H00277-00M)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 3800mAh lithium-polymer cell replaces the original battery in the HTC U11 and U11 Plus smartphones. It matches OEM part numbers 35H00277-00M and 35H00271-01M. Rated at 14.63Wh, it restores full operating capacity to the handset.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eU11 and U11 Plus compatibility:\u003c\/strong\u003e\n    Both handsets share the same battery bay dimensions (76.30 × 63.00 × 4.40mm), connector pinout, and BMS handshake protocol. One cell fits either variant 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 U11 Plus hardware. The BMS accepted the full charge current without tripping cutoff, and the fuel gauge IC tracked state-of-charge accurately by the second full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fast charge tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\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 U11 Plus after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a slightly different voltage-discharge curve than the aged cell the fuel gauge IC was calibrated to. When the phone demands high current — modem activity, screen-on bursts — the new cell's voltage drops faster than the IC expects. The IC reads that drop as a critical low-voltage event and triggers an emergency shutdown even though capacity remains. One full discharge-to-cutoff and recharge cycle at standard rate resets the coulomb counter and aligns the IC to the new curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not negotiating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the first connection post-install, the BMS in a new cell may not immediately present the expected voltage handshake to the HTC charge IC, causing the phone to fall back to standard 5V charging. This is not a fault — it resolves once the BMS completes its first full charge cycle and the charge IC re-negotiates the protocol. Plug into the original HTC charger rather than a third-party USB-PD adapter for the first cycle. Fast charging should resume normally from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392015335514,"sku":"BWCS-HTU112SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392015368282,"sku":"BWCS-HTU112SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392015401050,"sku":"BWCS-HTU112SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HTU112SL-1.webp?v=1779142904","url":"https:\/\/batteryweb.com\/products\/htc-u11-replacement-battery-385v-3800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}