{"product_id":"hp-elite-dragonfly-g1-replacement-battery-77v-6800mah-li-polymer","title":"EP04XL Replacement Battery for HP Elite Dragonfly G1 7.7V 6800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHP Elite Dragonfly G1 \/ G2 — 7.7V Li-Polymer Replacement Battery (EP04XL)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.7V, 6800mAh (52.36Wh) lithium-polymer battery for the HP Elite Dragonfly G1, G2, Dragonfly Max, and Dragonfly-8MK79EA. It replaces OEM part EP04XL and cross-references HSTNN-DB9J, HSTNN-IB8Y, L52448-1C1, and L52581-005 among others. The cell slots into the same bay as the original and uses the same BMS handshake protocol.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eG1, G2, Max, and 8MK79EA compatibility:\u003c\/strong\u003e\n    All four models share the same 7.7V battery rail, identical connector pinout, and the same BMS communication stack over SMBus. One cell fits all four without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge-discharge cycles on a G1 unit. The BMS handshake completed on first boot, state-of-charge reporting stabilised after three full cycles, and thermal cutoff thresholds behaved within spec under sustained CPU and display load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration for the Dragonfly:\u003c\/strong\u003e\n    After fitting this cell, run one 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 this platform.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Elite Dragonfly shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Dragonfly's BIOS maps discharge curves against data stored from the previous cell. With a new cell installed, those stored curves no longer match the actual voltage-capacity relationship of the fresh chemistry. Under full CPU plus display load, the BIOS sees voltage drop faster than its model predicts and triggers a protective shutdown before the cell is actually depleted. Running two to three full discharge-recharge cycles lets the fuel gauge IC re-learn the new cell's curve, after which the reported percentage tracks accurately to cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as \"poor\" or \"unknown\" immediately after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eHP's battery health check reads EEPROM data broadcast by the BMS — cycle count, rated Wh, and internal resistance — and compares it against expected values for the platform. A freshly installed cell starts with a cycle count of zero and EEPROM values that differ from the worn original, which the BIOS initially flags as an anomaly rather than a healthy cell. This is a firmware interpretation issue, not a fault with the battery. Boot into HP Support Assistant or run the built-in battery check after completing the calibration cycle; the health status should clear to normal once the BIOS has logged at least one full learn cycle at 100%.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409588224090,"sku":"BWCS-HPE996NB-1","price":88.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409588256858,"sku":"BWCS-HPE996NB-2","price":103.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409588289626,"sku":"BWCS-HPE996NB-3","price":114.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HPE996NB-1.webp?v=1779580129","url":"https:\/\/batteryweb.com\/products\/hp-elite-dragonfly-g1-replacement-battery-77v-6800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}