Originally Posted by android addicts
should I plug my SGS5 G900F 6 hours?
No you shouldn't. Nevertheless most people will tell you to do so anyway. The advice is intended to assure that your battery reaches 100% charge and gives you a good first impression of battery life. It's also stressful to your battery.
Ideally you'd charge to 85%, which is probably 0 - 2 hours charging depending on how much charge your battery has out of the box. Then aim for shallow discharge cycles thereafter. Running to depletion and high temperatures are the worst things that you can do to a lithium ion battery. And charging to 100% is stressful too.
Of course if you want maximum run time and will not be near an charging source, then you will probably charge to 100% anyway. A tradeoff between utility and overall battery life.
There are lots of existing threads on this subject, replete with useful information for anyone that does a search e.g. this