Battery Life

[Solpete]

I just bought a n9208 from a store in Hong Kong. I immediately installed Android 6.0.1. When my battery reaches 20 it drops to 15.. Then to 5 in a minute.. I hope this is just temporary. I fear I got a refurbished phone sent to me. It was in mint condition but the phone didn't have any screen protection on and the box said n9200 but the sticker on the phone n9208. Weird.

Replying to my own post... my battery life has gone from very poor to stellar. I had almost 7 hours SOT watching the US election using HD stream at 35% brightness... battery drops less than 1 percent per hour at night! All I did was disable all bloatware with package disabler and running greenify... really happy now was convinced that my battery was bad.