{"product_id":"acer-swift-3-sf314-511-51yl-replacement-battery-1155v-4550mah-li-polymer","title":"Acer Swift 3 SF314-511-51YL Replacement Battery AP20CBL 11.55V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAcer Swift 3 SF314-511 Series — 11.55V Li-Polymer Replacement Battery (AP20CBL)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a Li-Polymer replacement battery for the Acer Swift 3 SF314-511-51YL, SF314-511-71VL, SF314-43-R8GG, SF314-43-R3B9, and over 185 additional Swift 3 variants. It runs at 11.55V with a 4550mAh (52.55Wh) capacity, matching the OEM AP20CBL specification. Install it when the original cell no longer holds a usable charge or the laptop drops off battery faster than expected under normal workloads.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSwift 3 SF314 platform fitment:\u003c\/strong\u003e\n    These SF314 variants share the AP20CBL connector pinout, cell voltage rail, and BMS handshake protocol. The three-cell Li-Polymer stack runs a common 11.55V nominal across the series, so one cell revision covers all listed models without adapter or firmware change.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an SF314-511 chassis and confirmed the BMS negotiated correctly with the EC, reported accurate Wh figures in the OS, and held charge through a full cycle without thermal event or cutoff interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on Swift 3:\u003c\/strong\u003e\n    After fitting the new cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on first boot after every cell swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as poor immediately after fitting AP20CBL\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Swift 3 EC reads health data from EEPROM on the old cell and compares it against the new one during the first boot. A fresh AP20CBL has no cycle history, so the EC flags a mismatch and reports degraded health before any calibration has run. This is not a fault with the replacement cell. Run the full discharge-to-hibernate then uninterrupted charge cycle, and the BIOS learn routine will overwrite the stale EEPROM data with accurate readings from the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSwift 3 shutting down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC still holds calibration data mapped to the old cell's voltage curve. Under full CPU plus display load, the new cell's actual voltage drops faster than the gauge predicts, and the EC triggers a hard shutdown before the displayed percentage reaches zero. The fix is not a battery fault — it is a calibration gap. Complete two to three full discharge-and-charge cycles so the fuel gauge IC can remap its curve to the AP20CBL cell chemistry. After the third cycle, the shutdown threshold should track accurately down to approximately 3.0V per cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409565384794,"sku":"BWCS-ACP155NB-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409565417562,"sku":"BWCS-ACP155NB-2","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409565450330,"sku":"BWCS-ACP155NB-3","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ACP155NB-1.webp?v=1779580012","url":"https:\/\/batteryweb.com\/products\/acer-swift-3-sf314-511-51yl-replacement-battery-1155v-4550mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}