{"product_id":"chem-5580-replacement-battery-108v-6600mah-li-ion","title":"Chem 5580 Notebook Replacement Battery 10.8V 6600mAh DR202","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eChem 5580 \/ 6800 \/ ChemBook 5400 — 10.8V Li-ion Replacement Battery (DR202)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 6600mAh Li-ion battery for Chem notebook computers including the 5580, 6800, and USA ChemBook 5400 series. It replaces OEM part numbers DR202, EMC36, ME202BB, NL2020, and SMP02. Capacity is 71.28Wh — matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e5580, 6800, and ChemBook 5400 compatibility:\u003c\/strong\u003e\n    These three models share the same 10.8V battery rail, connector pinout, and BMS communication protocol, which is why a single cell covers all three. The EEPROM on the new cell carries the correct rated Wh data the BIOS expects to read during POST.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the 5580 platform. The BMS handshake completed without fault flags, and the protection circuit tripped correctly at both the high-voltage cutoff during charge and the low-voltage cutoff before deep discharge damage.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the 5580:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to hibernate cutoff — let the laptop shut itself down, not a manual power-off. Then charge uninterrupted to 100%. This forces the fuel gauge IC to re-learn the new cell's actual capacity curve and clears the inaccurate health warning the BIOS displays after every cell swap.\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 replacement on the 5580\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe BIOS reads health data from the battery's EEPROM — a small memory chip that stores cycle count, rated Wh, and charge history. When a new cell arrives, its EEPROM counters are at factory defaults, which the BIOS may flag as a mismatch against the old cell's logged data. This is not a fault with the new battery. Run the full discharge-to-hibernate then uninterrupted charge cycle once, and the BIOS battery learn cycle will update its reference data and clear the warning.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% remaining after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff — where output voltage drops sharply under combined CPU and display load — at a different point than the old cell did. The OS reads that voltage drop as near-zero charge and triggers an emergency shutdown, even though the percentage shown looks comfortable. Run two full discharge-to-hibernate and full-charge cycles back to back, and the fuel gauge IC will map the new cell's actual voltage curve correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410839961690,"sku":"BWCS-SP500HB-1","price":88.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410839994458,"sku":"BWCS-SP500HB-2","price":103.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410840027226,"sku":"BWCS-SP500HB-3","price":114.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SP500HB-1.webp?v=1779581321","url":"https:\/\/batteryweb.com\/products\/chem-5580-replacement-battery-108v-6600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}