{"product_id":"maibenben-maibook-s431-replacement-battery-76v-4800mah-li-polymer","title":"Maibenben MaiBook S431 Replacement Battery 7.6V 4800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMaibenben MaiBook S431 — 7.6V Li-Polymer Replacement Battery (CN6613-2S3P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.6V, 4800mAh (36.48Wh) lithium-polymer replacement battery for the Maibenben MaiBook S431 laptop. It uses OEM part number CN6613-2S3P and fits the S431 notebook directly. Install it when the original cell no longer powers the machine adequately or refuses to charge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMaiBook S431 fitment:\u003c\/strong\u003e\n    The S431 uses a 2S3P cell configuration on a 7.6V nominal rail. The CN6613-2S3P part number matches the connector pinout and BMS communication protocol that the S431 motherboard expects. Swapping in a mismatched cell will trigger a BIOS battery-unknown error immediately.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the cell through charge and discharge cycles on the S431 platform. The BMS handshake completed correctly, the BIOS recognised the battery without flags, and charge current stepped down cleanly at the 4.35V-per-cell threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the MaiBook S431:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge until the laptop hibernates on low battery, then charge uninterrupted to 100%. This resets the S431's battery learn cycle and clears the inaccurate health warning that appears in the BIOS after any cell replacement.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMaiBook S431 shutting down at 20–30% charge remaining\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 chemistry. The old EEPROM data sets incorrect low-voltage thresholds, so the system cuts power before the cell is actually empty. Under combined CPU and display load, voltage sag on an uncalibrated cell can hit the shutdown floor fast. Run two full discharge-to-hibernate then charge-to-100% cycles to let the fuel gauge IC recalibrate against real cell behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS showing incorrect Wh rating after CN6613-2S3P install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Wh figure the BIOS displays is read from EEPROM data stored in the battery's controller — it reflects the rated value programmed at manufacture, not a live measurement. If the number shown differs from 36.48Wh, the EEPROM value and the actual cell chemistry are reporting separately, which is normal across replacement cells from different production runs. This does not affect charging or discharge behaviour. Confirm the voltage rail reads 7.6V in the OS battery report — if it does, the cell is operating correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409568759898,"sku":"BWCS-MBS431NB-1","price":75.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409568792666,"sku":"BWCS-MBS431NB-2","price":89.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409568825434,"sku":"BWCS-MBS431NB-3","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MBS431NB-1.webp?v=1779580092","url":"https:\/\/batteryweb.com\/products\/maibenben-maibook-s431-replacement-battery-76v-4800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}