{"product_id":"acer-aspire-s-13-replacement-battery-1155v-4600mah-li-polymer","title":"Acer Aspire S 13 AP15O5L Compatible Battery 11.55V 4600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAcer Aspire S 13 S5-371 — 11.55V Li-Polymer Replacement Battery (AP15O5L)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.55V, 4600mAh (53.13Wh) lithium-polymer battery for the Acer Aspire S 13 series ultrabook. It replaces OEM part numbers AP15O5L, AP1505L, AP1503K, and AP15O3K. Fits the S5-371 chassis and all sub-models on that platform.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS5-371 platform compatibility:\u003c\/strong\u003e\n    Every S5-371 variant — including the 52JR and 53NX — runs the same 11.55V three-cell Li-Polymer architecture with a shared connector pinout and BMS handshake protocol. One cell covers the full range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on an S5-371 unit and confirmed the BMS completes charge handshake correctly, holds voltage above 10.8V at full CPU and display load, and does not trigger an early cutoff under sustained draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the S5-371:\u003c\/strong\u003e\n    After installing, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the S5-371 displays 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 poor battery health immediately after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe S5-371 BIOS reads health data stored in the old cell's EEPROM before the new cell has completed a learn cycle. Until calibration runs, the firmware compares current state-of-charge against stale reference data and flags the battery as degraded. This is not a fault with the replacement cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the BIOS a fresh reference point and clears the warning on next boot.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% shown on the OS fuel gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge shows 20–30% remaining, but the cell voltage has already dropped below the BMS cutoff threshold — typically around 9.9V under load on this platform. The system shuts down to protect the cell even though the percentage looks safe. Run two to three full discharge-to-charge cycles and the OS gauge will align with real cell voltage. After calibration, the shutdown point moves back to below 5% as expected.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409737777242,"sku":"BWCS-ACS130NB-1","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409737810010,"sku":"BWCS-ACS130NB-2","price":124.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409737842778,"sku":"BWCS-ACS130NB-3","price":136.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ACS130NB-1.webp?v=1779580582","url":"https:\/\/batteryweb.com\/products\/acer-aspire-s-13-replacement-battery-1155v-4600mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}