{"product_id":"acer-iconia-one-8-b1-850-replacement-battery-38v-4500mah-li-polymer","title":"Acer Iconia One 8 B1-850 Compatible Battery PR-2874E9G 3.8V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAcer Iconia One 8 B1-850 — 3.8V Li-Polymer Replacement Battery (PR-2874E9G)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe PR-2874E9G is a 3.8V, 4500mAh Li-Polymer battery for the Acer Iconia One 8 B1-850 8-inch Android tablet. It also fits the A6001 and B1-850-K35X variants that share the same battery bay and connector spec. Capacity is 17.1Wh, matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eB1-850, A6001, and B1-850-K35X compatibility:\u003c\/strong\u003e\n    These three models share the same PCB layout, connector pinout, and charge IC, so the same cell fits all three without modification or adapter.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the B1-850 and confirmed the BMS handshake completes correctly — the tablet accepted the battery without error flags or charge interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    After fitting this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This resets the fuel gauge IC against the new cell capacity and clears the inaccurate percentage readings that commonly appear after a swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTablet shutting down at 15–25% remaining after battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a faulty battery. When the display backlight and WiFi radio draw current simultaneously, the cell voltage dips sharply under combined load. The system interprets that voltage dip as a critically low state and triggers an emergency shutdown before the percentage counter catches up. A full recalibration cycle — one complete discharge to shutoff followed by an uninterrupted charge to 100% — lets the fuel gauge IC map the new cell's voltage curve accurately and eliminates the early cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging not available after fitting a new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe B1-850's charge IC runs a USB-PD negotiation check on the first accepted charge cycle after a new cell is detected. Until that cycle completes, the tablet may fall back to standard 5V charging and show slower charge progress. Charge the tablet fully from near-empty using the original Acer adapter without interruption. After that first complete cycle, the fast charge protocol re-engages and the charge IC operates normally at the higher voltage rail.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43425850818650,"sku":"BWCS-ACB850SL-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43425850851418,"sku":"BWCS-ACB850SL-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43425850884186,"sku":"BWCS-ACB850SL-3","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ACB850SL-1.webp?v=1779929950","url":"https:\/\/batteryweb.com\/products\/acer-iconia-one-8-b1-850-replacement-battery-38v-4500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}