A removable battery assembly configured for use with an electrically powered surgical instrument operable to surgically interface with human tissue, the removable battery assembly comprising: an outer shell having an upper portion, a lower portion, and defining a shell interior, the outer shell configured to form a hand grip of an electrically powered surgical instrument when secured to the surgical instrument to permit handling of the surgical instrument by one hand of an operator, the upper portion configured to removably connect to a portion of the surgical instrument; and a rechargeable battery disposed in the shell interior and configured to power the surgical instrument, wherein the outer shell includes a plurality of exterior contacts electrically coupled to the rechargeable battery and configured to supply power from the rechargeable battery to the surgical instrument to operate the surgical instrument.
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