What AC adapters and batteries are compatible with the HP EliteBook 840 G2?
The HP EliteBook 840 G2 supports 65W and 45W HP Smart AC adapters, as well as a 45W 2-prong 7.4mm DC jack AC adapter (on select models). Compatible batteries include a 3-cell 50 Wh 4.45 Ah long-life battery and a 3-cell 24 Wh 2.2 Ah long-life battery.
From the official HP Elitebook 840 G2 Notebook PC manual, page 21
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