The initial Lollipop build destroyed our beloved Note 4. I had many of the same issues after the Lollipop update (5.0) I even resorted to buying an extended battery. I got tired of the extended batteries bulk... I went with the Anker batteries and just started switching batteries in the afternoon.... Now after the 5.1.1 my battery has improved somewhat... I can't say for sure if it's as good or better or worst than KK because I just don't remember and also my usage has changed a lot the last few months.... I stream Sirius over 4G most of the day with multiple texts and an email here and there and after an 8 hour day I am down to about 60-70% battery on the Anker. On the original it is 10-15% less than that... I don't know if the Samsung batteries just don't hold up or if the 5.0 update did indeed kill the physical battery but I can attest that the Ankers last longer. For the $25 for 2 batteries and charger I have to say it is well worth it. I am even tempted to order another set as I keep one at work always charging and I'd like to have another set at home charging. I would just eliminate charging the phone all together and just move to swapping batteries all the time.