GreenTechLLC 828226-005 EO04XL laptop battery HP EliteBook Folio G1 7.7V 38WHR 4820mAh 4-cell white connector

Replacement battery for HP EliteBook Folio G1

This 4-cell lithium-ion pack is built to fit the HP EliteBook Folio G1 and replaces OEM part numbers 828226-005, 827927-1B1, 827927-1C1, EO04038XL-PL, EO04XL and HSTNN-IB7I. It is a direct swap for owners whose original cell has lost runtime or no longer holds charge. The white connector matches the motherboard header on the target notebook. It is not intended for any other laptop family or form factor.

Capacity and runtime headroom

Rated at 7.7 V and 4820 mAh, the unit stores 38 Wh of energy. That capacity supports typical office workloads such as document editing, web browsing and video playback for several hours on a full charge. Heavy multi-tasking, sustained CPU loads or high screen brightness will draw the pack down faster. The 4-cell layout limits total watt-hours, so users needing all-day autonomy away from mains power will find the reserve insufficient.

Lithium-ion cell constraints

The chemistry delivers stable voltage until near depletion, then drops sharply; the onboard protection circuit cuts output to prevent deep discharge. Self-discharge is low, but storing the pack at full charge for months accelerates capacity loss. CE, FCC and RoHS certifications confirm compliance with safety and substance restrictions. The battery cannot be fast-charged beyond the laptop's native controller limits, and it will not operate outside the 7.7 V design window.