{"product_id":"ibm-thinkpad-310-replacement-battery-108v-4000mah-ni-mh","title":"IBM ThinkPad 310 Replacement Battery 10.8V 4000mAh 11J8604","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM ThinkPad 310 Series — 10.8V Ni-MH Replacement Battery (11J8604)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 4000mAh Ni-MH replacement battery for the IBM ThinkPad 310 series notebook. It fits the ThinkPad 310, 310D, 310E, and 310ED. It replaces OEM part numbers 11J8604, 11J8639, and ASM11J8645.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eThinkPad 310 series compatibility:\u003c\/strong\u003e\n    The 310, 310D, 310E, and 310ED all share the same battery bay dimensions, connector pinout, and 10.8V voltage rail. One battery fits the entire line because IBM standardised the bay across this generation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge and discharge cycles on this cell and monitored the BMS handshake. The pack communicates correctly with the ThinkPad 310 charge controller and holds voltage through full discharge without premature cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle conditioning for Ni-MH:\u003c\/strong\u003e\n    Ni-MH chemistry in this generation of ThinkPad benefits from a full uninterrupted charge immediately after installation. Do not interrupt the first charge — partial first charges on Ni-MH can trigger the BIOS battery learn cycle to record a false low-capacity baseline.\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 after installing a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ThinkPad 310 BIOS stores battery health data in EEPROM and compares it against readings from the previous cell. When a new battery is installed, the EEPROM data does not match the new cell's characteristics, so the BIOS flags it as unknown or poor. This is not a fault with the replacement cell. Run one complete discharge to hibernate-cutoff, then charge uninterrupted to 100%. That sequence resets the BIOS battery learn cycle and clears the health warning.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFuel gauge jumping erratically or reading 0% then 100% in the first few cycles\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC in the ThinkPad 310 calibrates itself against the cell it has learned over time. A replacement cell has different internal resistance and discharge characteristics than the aged original. The gauge has no reference data yet, so readings are unreliable for the first two to three full cycles. Run two or three complete discharge-then-charge cycles and the fuel gauge IC will recalibrate against the new cell — readings will stabilise around 10.8V at full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410880725082,"sku":"BWCS-AC610HB-1","price":87.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410880757850,"sku":"BWCS-AC610HB-2","price":103.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410880790618,"sku":"BWCS-AC610HB-3","price":114.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AC610HB-big.webp?v=1779581442","url":"https:\/\/batteryweb.com\/products\/ibm-thinkpad-310-replacement-battery-108v-4000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}