{"product_id":"acer-chromebook-13-cb5-311-replacement-battery-114v-3000mah-li-polymer","title":"Acer Chromebook 13 CB5-311 Replacement Battery AC14B18J 11.4V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAcer Chromebook 13 CB5-311 \/ Aspire E3 \/ V3 — 11.4V Li-Polymer Replacement Battery (AC14B18J)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.4V, 3000mAh (34.2Wh) Li-Polymer battery for the Acer Chromebook 13 CB5-311, Aspire E3-111, Aspire V3, and related models using the AC14B18J cell. It replaces the original pack when the existing cell no longer holds a usable charge. OEM part numbers covered include AC14B18J, KT.0040G.004, KT0030G.004, and AC14B13J.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCB5-311, Aspire E3, and V3 platform fit:\u003c\/strong\u003e\n    These models share the same 11.4V three-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol — which is why one pack covers all of them. The charge controller expects the same EEPROM signature across the range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on a CB5-311 unit. The BMS accepted the cell without fault codes, charge acceptance was normal from first plug-in, and the protection circuit tripped correctly at the low-voltage cutoff threshold during discharge testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on ChromeOS:\u003c\/strong\u003e\n    After fitting, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. ChromeOS reads fuel gauge data from the cell's EEPROM — skipping this step leaves the health indicator stuck on stale data from the old pack, showing inaccurate capacity warnings for weeks.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the CB5-311 shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eChromeOS tracks discharge curves against stored cell data. When a new cell goes in, the fuel gauge IC hasn't mapped the new chemistry's voltage slope yet. The system sees the voltage drop off sharply under CPU-plus-display load and interprets it as a depleted cell — triggering shutdown well above the real empty threshold. Two to three full calibration cycles clear this. After each full discharge-to-hibernate and uninterrupted full charge, the fuel gauge tightens its model of the new cell's curve and the early shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eChromeOS reporting battery health as \"Poor\" or 0% on a brand-new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because ChromeOS pulls health status from EEPROM data written to the battery controller — not from a live capacity measurement. The old cell's degraded charge cycle count and health flag persist until the learn cycle overwrites them. It is not a fault with the replacement cell. Do a full discharge to hibernate cutoff, charge to 100% without interruption, and check the battery status page at chrome:\/\/system — the health figure updates after that first complete cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410737266778,"sku":"BWCS-ACE150NB-1","price":70.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410737299546,"sku":"BWCS-ACE150NB-2","price":82.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410737332314,"sku":"BWCS-ACE150NB-3","price":91.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ACE150NB-1.webp?v=1779580772","url":"https:\/\/batteryweb.com\/products\/acer-chromebook-13-cb5-311-replacement-battery-114v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}