Assalamualaikum wbt, 

The main objective of this post was to throw every negative things I encounter but I realize that wont do any good so lets take it on the bright side.

Every solution have their own problem right? (yes, you read it correctly), so this gonna be an advice for myself and maybe to those who kind of gonna experience it on the future. 

The story is, I have this photo shoot job that required me to spend two hours on side, so I tot that one full charged battery equipped on my Sony A6000 will be enough. Apparently not! The hours on the event dragged longer than I expected and my battery on the first hour is on its critical situation, thank God all the important shoot already covered, the things that left is 'the clown show'. 

So these are few advice for an armature-solo photographer like me. Panic is the last thing I wanna do.