{"product_id":"umi-umidigi-a7-pro-replacement-battery-385v-4000mah-li-polymer","title":"UMI UMIDIGI A7 Pro Compatible Battery 3.85V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUMI UMIDIGI A7 Pro — 3.85V Li-Polymer Replacement Battery (1ICP\/5\/65\/87)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4000mAh Li-Polymer battery for the UMIDIGI A7 Pro smartphone. It replaces the original cell when the phone holds a short charge, shuts down unexpectedly, or will no longer power on. Capacity is 4000mAh (15.4Wh), matching the OEM specification under part number 1ICP\/5\/65\/87.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUMIDIGI A7 Pro fitment:\u003c\/strong\u003e\n    The A7 Pro uses a 76.30 x 64.40 x 4.40mm Li-Polymer cell on a 3.85V rail. This battery matches that physical footprint and voltage. The BMS connector and charge IC handshake are confirmed against the A7 Pro's power management circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the cell through full charge and discharge cycles on the A7 Pro. The BMS accepted the charge protocol correctly, and the fuel gauge IC tracked state-of-charge without erratic jumps after the first complete cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the UMIDIGI A7 Pro reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe A7 Pro uses a fuel gauge IC that builds its state-of-charge model against the old cell's discharge curve. When a new cell goes in, that learned curve no longer matches reality. The IC may show 40% charge while the actual cell voltage is already at 3.6V or lower. One full discharge down to automatic shutdown, followed by an uninterrupted charge to 100%, resets the coulomb counter and brings the percentage readings back in line with actual cell voltage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC still holds the old cell's low-voltage threshold model. The replacement cell hits a voltage cliff — it cannot sustain the rail under modem or display load — before the IC registers a low-battery warning. The phone cuts out because the actual cell voltage drops below 3.4V while the gauge still reads 25%. Run one full unconstrained discharge cycle to automatic shutdown, then charge uninterrupted to 100%, and the IC will recalibrate its cutoff threshold to the new cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391879741530,"sku":"BWCS-UMA710SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391879774298,"sku":"BWCS-UMA710SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391879807066,"sku":"BWCS-UMA710SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UMA710SL-1.webp?v=1779142499","url":"https:\/\/batteryweb.com\/products\/umi-umidigi-a7-pro-replacement-battery-385v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}