Manchester City had taken an early lead on Tuesday night at Leigh Sports Village, Vicky Losado scoring her third goal of the season with a thumping drive.
United's victory was a tale of determination and persistence. Ivana Ferreira Fuso levelled the score after half-an-hour with her second goal of this year's Continental Cup, but only after Kirsty Hanson had pursued a fumble from City goalkeeper Kamira Taieb.
A frantic, end-to-end second half followed, the highlight of which was Batlle's winner. The Spanish full-back followed Hanson's example, winning the ball back in the City area before finishing well to put United ahead.