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In this paper we describe a project we initiated to investigate individualpixels in the downloaded Kepler apertures in order to find objects in thebackground of the main targets with variable brightness. In the first paper ofthis series we discovered and investigated 547 short-period eclipsing binaries(Bienias et al. 2021). Here we present the independent discovery of 26 new RRLyrae stars in the Kepler background pixels obtained during the primarymission, and provide continuous and precise photometry for these objects.Twenty-one of these stars were already noted by Gaia or the Pan-STARRS survey.This new population of dominantly faint and distant RR Lyrae stars increases by50% and complements nicely the 52 already known main target RR Lyrae stars inthe original Kepler field. Despite their faintness, the four-yearquasi-uninterrupted light curves of these stars allow an unprecedented view ofthese faint halo objects. We present an analysis of the light curves of the newRR Lyrae sample, verify their classification using Fourier parameters, anddiscuss the properties of these newly found pulsating variable stars. Mostnotably, this is the first time that such faint RR Lyrae stars have beeninvestigated with the help of a photometric data set with outstanding cadenceand precision. Interestingly, these objects share the properties of theirbrighter siblings in terms of sub-class characteristics, additional modecontent, and modulation occurrence rates.

Kepler Pixel Project -- background RR Lyrae stars in the primary Kepler mission field of view