ASUS ZenFone models are pretty solid, I own ZC550KL with 5000 mAh (sic!) battery and it works like a charm, up to 3-4 days without plugging. But beware: speake

ASUS ZenFone models are pretty solid, I own ZC550KL with 5000 mAh (sic!) battery and it works like a charm, up to 3-4 days without plugging. But beware: speaker on my model sucks donkey balls, sometimes I can't even hear a call from my pocket.