{"product_id":"umi-umidigi-a1-pro-replacement-battery-385v-3000mah-li-polymer","title":"UMI UMIDIGI A1 Pro Compatible Battery 3.85V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eUMI UMIDIGI A1 Pro — 3.85V Li-Polymer Replacement Battery (1ICP\/5\/64\/85)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3000mAh (11.55Wh) Li-Polymer cell replacing part number 1ICP\/5\/64\/85 in the UMIDIGI A1 Pro smartphone. It fits the original battery bay and connects via the stock flex connector. Use the capacity figure above — not third-party listings, which vary.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUMIDIGI A1 Pro fit:\u003c\/strong\u003e\n    The A1 Pro uses a 3.85V nominal rail with a single-cell Li-Polymer pack at 70.62 × 56.30 × 4.30mm. This cell matches that physical envelope and voltage rail exactly, so the charge IC and BMS handshake proceed without mismatches.\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 load draws that mirror the A1 Pro's modem, display, and idle states. The BMS held cutoff at the correct low-voltage threshold and accepted charge termination without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use after fitting this cell, disable fast charging and run one full discharge down to automatic shutdown, then charge to 100% uninterrupted. This lets the A1 Pro's fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins.\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 A1 Pro reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe A1 Pro's fuel gauge IC stores a learned discharge curve from the original cell. When you install a new cell, that stored curve no longer matches actual cell behaviour. The gauge reads voltage and applies the old curve, so the percentage shown can be off by 10–20% in either direction. One complete discharge-charge cycle with no interruptions forces the IC to relearn the new cell's voltage-to-capacity relationship and restores accurate readings.\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 modem or display pulls a brief high-current spike and the cell voltage drops below the BMS cutoff threshold faster than the fuel gauge expects. A new cell has higher internal impedance than a settled one, which makes voltage sag under load more pronounced in the first few cycles. The phone interprets the voltage cliff as a dead cell and shuts down even though the gauge shows charge remaining. After three to five full discharge-charge cycles, internal impedance drops and the shutdowns stop — no replacement needed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391877873754,"sku":"BWCS-UMA110SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391877906522,"sku":"BWCS-UMA110SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391877939290,"sku":"BWCS-UMA110SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-UMA110SL-1.webp?v=1779142499","url":"https:\/\/batteryweb.com\/products\/umi-umidigi-a1-pro-replacement-battery-385v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}