5.1 is what the adapter is pulling. All of that isn't getting to the phone. Funny thing for my is the phone charges faster off my blackberry 0.75a charger then it does off my Galaxy I 1a charger.
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Sig. Upd. 11/04/2013 --SGS4, MF3 ROM, ZeroLemon Extended Battery--
Previous Phones: Samsung Galaxy Note II w/ CleanROM ACE, SGS 3, Galaxy Note, Samsung SGSII, Motorola Atrix, Samsung Captivate- Perception ROM, ATT Tilt2- Energy ROM, GTX/CHT, July 21, 23121, HTC Fuze, ATT Tilt, HTC 8125