  We embark on a detailed study of the lightcurves of Keplers most Earth-like
exoplanet host stars using the full length of Kepler data. We derive rotation
periods, photometric activity indices, flaring energies, mass loss rates,
gyrochronological ages, X-ray luminosities and consider implications for the
planetary magnetospheres and habitability. Furthermore, we present the
detection of superflares in the lightcurve of Kepler-438, the exoplanet with
the highest Earth Similarity Index to date. Kepler-438b orbits at a distance of
0.166AU to its host star, and hence may be susceptible to atmospheric
stripping. Our sample is taken from the Habitable Exoplanet Catalogue, and
consists of the stars Kepler-22, Kepler-61, Kepler-62, Kepler-174, Kepler-186,
Kepler-283, Kepler-296, Kepler-298, Kepler-438, Kepler-440, Kepler-442,
Kepler-443 and KOI-4427, between them hosting 15 of the most habitable
transiting planets known to date from Kepler.
