{"product_id":"acer-aspire-s7-replacement-battery-74v-4650mah-li-polymer","title":"Acer Aspire S7 Replacement Battery AP12F3J 7.4V 4650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAcer Aspire S7 Series — 7.4V Li-Polymer Replacement Battery (AP12F3J)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 4650mAh (34.41Wh) lithium-polymer replacement battery for the Acer Aspire S7 ultrabook line. It fits the Aspire S7 13\", Aspire S7-391-6822, and Aspire R14, among other S7 variants. The AP12F3J cell slides into the same slot as the original and connects via the same multi-pin BMS connector.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAspire S7 and R14 compatibility:\u003c\/strong\u003e\n    These models share the same flat Li-Polymer cell format, 7.4V two-cell configuration, and BMS handshake protocol. The AP12F3J part number covers all of them because the connector pinout, cell dimensions (308.69 x 128.23 x 3.06mm), and BMS communication bus are identical across the S7 series run.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an Aspire S7-391 under a mixed CPU and display load cycle. The BMS held a stable cutoff at the correct lower voltage threshold and allowed a clean full charge to 4.2V per cell without triggering thermal protection.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the S7:\u003c\/strong\u003e\n    After fitting this battery, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on S7 hardware.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting poor battery health immediately after fitting a new S7 cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Aspire S7 BIOS reads health data stored in the battery's EEPROM, not from live cell measurements. When a new cell arrives, the EEPROM carries factory defaults that don't match the BIOS's stored charge history from the old battery. This mismatch triggers a \"poor health\" or \"replace battery\" flag even though the new cell is at full capacity. Run one complete discharge-to-hibernate followed by a full uninterrupted charge — the BIOS learn cycle rewrites the EEPROM reference and the health flag clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAspire S7 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 hasn't yet calibrated against the new cell's actual voltage curve. The old calibration data predicts a voltage floor that the new cell's chemistry hits much later, so the shutdown fires well before the cell is actually depleted. It's not a faulty battery — it's a calibration lag. Complete two to three full discharge-to-hibernate and full-charge cycles to let the fuel gauge IC map the new curve accurately; the cutoff point will shift back toward 5–10% where it belongs.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409794859098,"sku":"BWCS-ACS700NB-1","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409794891866,"sku":"BWCS-ACS700NB-2","price":123.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409794924634,"sku":"BWCS-ACS700NB-3","price":135.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ACS700NB-1.webp?v=1779580871","url":"https:\/\/batteryweb.com\/products\/acer-aspire-s7-replacement-battery-74v-4650mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}