{"product_id":"maibenben-s436-replacement-battery-114v-4100mah-li-polymer","title":"Maibenben S436 Replacement Battery 11.4V 4100mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMaibenben S436 — 11.4V Li-Polymer Replacement Battery (PF4WN-00-17-3S1P-0)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.4V, 4100mAh (46.74Wh) Li-Polymer cell replaces the original battery in the Maibenben S436 notebook. It matches the OEM voltage rail, connector pinout, and physical footprint of the S436 battery bay. Cross-compatible part numbers include PF4WN-00-17-3S1P-0, PF4WN-03-17-3S1P-0, and U45A1HPFS01.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS436 platform fit:\u003c\/strong\u003e\n    All three OEM part numbers listed above share the same 3S1P cell configuration, 11.4V nominal rail, and BMS handshake protocol on the S436 motherboard — swapping between them does not require a firmware change or connector adapter.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the S436 platform. The BMS negotiated correctly with the system EC, charge current stepped down as expected at the 4.2V per-cell ceiling, and no protection-trip faults were logged during load testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap calibration on the S436:\u003c\/strong\u003e\n    After fitting this cell, run the battery down until the laptop hibernates on low-charge cutoff, then charge uninterrupted to 100%. This single full cycle resets the BIOS battery learn sequence and clears the inaccurate health or capacity warning that appears after every cell replacement on this model.\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 the S436 replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen you swap the physical cell, the BIOS still holds EEPROM data from the old battery — cycle count, wear level, and design capacity logged against the previous unit. The firmware reads that stale data and flags health as degraded before the new cell has run a single cycle. This is not a fault with the replacement cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the battery controller to rewrite its learn data against the new cell's actual charge curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eS436 shutting down at 20–30% charge shown on the fuel gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the S436 estimates remaining capacity against a stored model of the previous cell. A new cell with a different discharge curve hits a voltage point the gauge has not mapped, and the system reads it as critically low before the cell is actually depleted. The laptop shuts down to protect against over-discharge even though real charge remains. Run two to three full discharge-and-recharge cycles to let the fuel gauge IC recalibrate its model against the new cell — after calibration, the reported percentage should track accurately down to the 5–8% low-battery threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409561714778,"sku":"BWCS-HSU452NB-1","price":85.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409561747546,"sku":"BWCS-HSU452NB-2","price":101.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409561780314,"sku":"BWCS-HSU452NB-3","price":113.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HSU452NB_1.webp?v=1779580014","url":"https:\/\/batteryweb.com\/products\/maibenben-s436-replacement-battery-114v-4100mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}