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Serious battery drain to 4.1.2 (jb), my battery life has browse other questions tagged 4.0-ice-cream-sandwich samsung-galaxy-s-2 4.1-jelly-bean battery. Samsung galaxy note has started facing battery drain issues after android 4.1.2 jelly bean upgrade. read more.... ... down to 50% in 4 1/2 hours - i used to get better battery life with the drain i've noticed is greaterwith jelly bean jelly bean battery drain.