HP Battery 3 Cell 49WH 4.25Ah LI

HP 854109-850 is a three-cell lithium-ion primary battery listed as a spare part for the HP EliteBook 820 G4 and HP EliteBook 828 G4 notebooks. It supplies power when these computers are used away from an AC connection or replaces the installed battery.

Its 49 Wh energy capacity and 4.25 Ah charge capacity, alongside its three-cell design and lithium-ion chemistry, identify this service part for the supported notebook models.

HP’s maintenance guide describes the battery as user-replaceable. Removal involves opening the notebook’s bottom cover, loosening the battery’s captive screw and lifting it by its tab. Installation follows the reverse procedure, so the part is intended for internal replacement rather than use as an external power accessory.

For the listed EliteBook models, it provides battery power for mobile work, study and other notebook use away from a wall outlet. The compatibility and specifications here are those given for part number 854109-850.