{"product_id":"ibm-thinkpad-x220-replacement-battery-111v-4400mah-li-ion","title":"IBM ThinkPad X220 11.1V Replacement Battery 0A36281","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM ThinkPad X220 \/ X230 — 11.1V Li-ion Replacement Battery (0A36281)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the ThinkPad X220, X220i, X220s, and X230. It matches the OEM voltage rail and connector used across the X220 and X230 platform. Install it when the original battery no longer holds a usable charge or the system reports degraded health.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX220 and X230 platform fit:\u003c\/strong\u003e\n    Lenovo carried the same 11.1V battery bay, connector pinout, and BMS handshake protocol across the X220, X220i, X220s, and X230. One cell SKU covers all four models because the charge controller sees identical voltage and communication data from each.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on an X220 and X230 under mixed CPU and display load. The BMS handshake completed without fault codes, charge termination triggered correctly at 100%, and discharge cutoff held at the expected low-voltage threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on ThinkPad firmware:\u003c\/strong\u003e\n    After fitting this cell, run a full discharge 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 X-series ThinkPads.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the X220 BIOS flags a new battery as poor health immediately after swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ThinkPad BIOS stores learned capacity data in EEPROM tied to the original cell. When a new cell arrives, that stored data no longer matches the actual chemistry, so the firmware reports poor health before it has measured anything. This is not a fault with the replacement cell — it is stale EEPROM data. Running one full discharge-to-hibernate then a full uninterrupted charge gives the BIOS enough data to overwrite the old values. After two to three cycles the health indicator stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eX220 shutting down abruptly at 20–30% 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 actual discharge curve. The gauge loses track of the real state of charge and the system hits the firmware low-voltage cutoff earlier than the percentage shown suggests. Under full CPU plus display load, voltage sag accelerates that cliff. Run two full discharge cycles to hibernate cutoff followed by full charges — after that the gauge reads against measured cell data, not the stale profile from the old battery. If shutdowns persist past three cycles, check that the BIOS battery threshold setting is not manually capped above 20%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409813405786,"sku":"BWCS-IBX220NB-1","price":63.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409813438554,"sku":"BWCS-IBX220NB-2","price":74.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409813471322,"sku":"BWCS-IBX220NB-3","price":82.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IBX220NB-1.webp?v=1779581043","url":"https:\/\/batteryweb.com\/products\/ibm-thinkpad-x220-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}