Possible Solution - I too upgraded my Samsung S5 to Lollipop (on 2/5/15) and immediately started to suffer from battery drain. Even while charging using a Verizon branded 2.1a supply (note, it was NOT a Samsung charger), I could barely get my phone to charge (normally, I could go from a nearly empty battery to a full charge in less than 2hrs). Anyhow, I called Samsung Tech Support (888-987-4357) and the representative's suggestion was to perform a total factory reset (which is the LAST thing I want to do). I said thanks and hung-up. So after reading some suggestions on some forums, I decided to clear the cache of the "Google Play Services" app (which was only 335kb in size), and recharge the phone using my Samsung charger that came with the phone. Immediately after doing this and plugging in my phone, I noticed that the phone was again charging quickly. I left it plugged in overnight and disconnected it this morning at 6am. For the next 30 minutes, the only thing that I used the phone for was the alarm (I kept hitting snooze), and at 630am, I lost only 1% battery, a pleasant surprise. Then from 730-9pm, I streamed Sirius while at the gym and checked some emails and text messages. It is now 4.5hrs later and I still have 70% battery life. Tremendous improvement since yesterday and my battery status indicator shows that I still have 9hrs of charge left at 70%. Note, yesterday when I had all these problems, even with an 82% charge, the indicator said that my expected battery would be empty in 3hrs! I'm keeping my fingers crossed that this was a possible fix, without having to perform a total factory reset. If you want to try this fix: Goto Settings > Applications > Application Manager > DOWNLOADED (I did NOT choose Running) > Google Play Services > Clear Cache. Like I said, I am keeping my fingers crossed...Hope it works for you too.