48 hours so far on my Samsung Admire extended battery and i'm still at 51%! This thing is awesome :) i'm anxious to see how well it holds up when I get to 15% and lower but so far I highly recommend this battery. It is a 3500mAh battery here is a link to the listing http://www.ebay.com/itm/251034645526?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649