{"product_id":"ibm-thinkpad-x200-replacement-battery-108v-4400mah-li-ion","title":"IBM ThinkPad X200 Replacement Battery 10.8V 4400mAh 42T4534","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM ThinkPad X200 Series — 10.8V Li-ion Replacement Battery (42T4534)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 4400mAh (47.52Wh) Li-ion battery for the ThinkPad X200 and X200S family of business laptops. It replaces IBM OEM part numbers 42T4534, 42T4536, 42T4538, 42T4540, and related FRU\/ASM variants. Physical dimensions are 207.17 × 53.24 × 22.90mm — matching the standard 6-cell bay on these models.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eThinkPad X200 and X200S platform fit:\u003c\/strong\u003e\n    The X200 and X200S share the same battery bay geometry, connector pinout, and BMS handshake protocol. That is why a single cell covers both variants, including the X200S 7465 and X200 7454 sub-models.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a ThinkPad X200 chassis and confirmed the BMS initialised cleanly — no fault codes, no charge inhibit flag, and BIOS accepted the pack without triggering a \"battery not recognised\" error.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration after install:\u003c\/strong\u003e\n    After fitting, run the laptop on battery until it hibernates at the low-voltage cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that shows after every cell swap on ThinkPad hardware.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as poor immediately after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThinkPad firmware stores battery health data in EEPROM on the pack itself. When a new cell arrives, the EEPROM contains factory defaults that do not match the laptop's learned charge history. The BIOS reads those defaults, compares them against the accumulated cycle data it expects, and flags the pack as degraded. One full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite its battery learn data against the new cell, clearing the false warning.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shutting down at 20–30% charge shown on the gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff failure, not a fuel gauge error. Under combined CPU and display load, the cell voltage drops faster than the gauge IC can track — when it hits the BMS cutoff threshold (around 9.0V for a 10.8V 3S pack), the laptop shuts off even though the gauge still shows remaining capacity. The fuel gauge IC calibrates its empty-point estimate over several full cycles. Run three complete discharge-to-hibernate then full-charge cycles and check whether the shutdown point moves up toward the real empty voltage of 9.0V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410822758490,"sku":"BWCS-IBX200NB-1","price":94.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410822791258,"sku":"BWCS-IBX200NB-2","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410822824026,"sku":"BWCS-IBX200NB-3","price":117.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IBX200NB-1.webp?v=1779581243","url":"https:\/\/batteryweb.com\/products\/ibm-thinkpad-x200-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}