{"product_id":"notebook-co-co-6400at-replacement-battery-12v-3800mah-ni-mh","title":"NoteBook Co. 6400at Replacement Battery 12V 3800mAh DR36","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNoteBook Co. Co 6400at — 12V Ni-MH Replacement Battery (DR36)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V, 3800mAh (45.6Wh) nickel-metal hydride replacement battery for the NoteBook Co. Co 6400at notebook computer. It replaces OEM part numbers DR36 and DR36S. The battery restores unplugged operation to Co 6400at systems where the original cell has degraded or failed entirely.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCo 6400at platform fit:\u003c\/strong\u003e\n    The Co 6400at uses a 12V Ni-MH cell with a specific connector and charge-management handshake. Both DR36 and DR36S are direct part number matches for this platform — the voltage rail and BMS communication remain consistent across the revision.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on a Co 6400at system. The BMS accepted the cell without fault flags, and charge current ramped correctly through the Ni-MH delta-V cutoff termination at full capacity.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle conditioning on Ni-MH:\u003c\/strong\u003e\n    After installing, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100%. Ni-MH cells in laptops require this to reset the BIOS battery learn cycle — skipping it leaves the fuel gauge reporting inaccurate state-of-charge data for the life of the cell.\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 swapping the Co 6400at cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Co 6400at BIOS reads health data from EEPROM values stored during the original cell's service life. When a new cell is installed, those stored values no longer match the actual cell state, so the BIOS flags the battery as degraded or unknown. This is not a fault with the replacement cell. Running a full discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the battery learn cycle and overwrites the stale EEPROM data. After one or two full cycles, the health status clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCo 6400at shutting down unexpectedly while the OS gauge still shows 20–30%\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet calibrated against the new Ni-MH cell's actual discharge curve. The IC uses an older reference curve and misjudges how much charge remains — the real voltage cliff arrives before the displayed percentage reaches zero. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge tracks. Run two full discharge-to-hibernate and charge-to-100% cycles to let the IC recalibrate, then verify the resting voltage at full charge reads at or above 12V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410857033818,"sku":"BWCS-DR36HB-1","price":89.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410857066586,"sku":"BWCS-DR36HB-2","price":105.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410857099354,"sku":"BWCS-DR36HB-3","price":118.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DR36HB-big.webp?v=1779581376","url":"https:\/\/batteryweb.com\/products\/notebook-co-co-6400at-replacement-battery-12v-3800mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}