I have Lollipop on mine and it isn't too bad for me. I work all the time and use a Bluetooth speaker for music and it doesn't drain it that fast. When I'm at home watching videos and whatnot, it goes a little quicker. I have a power bank that comes in handy, too. It's all in how you use it. Keep your data off when you don't need it, keep your screen brightness down as far as you can. Enough of my babbling, that's basically every phone. I've had mine for a few months and it's not too bad. I hope that helps.
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