Samsung galaxy & iphone charging problems part 1

Charging problems part 1

I am sure everyone that got here had these problems before:
1. Battery last for short time
2. Charging is not getting to 100% charge
3. The charging processes is too long
4. Not sure if his phone battery is holding charge, or if he buy new one it will last for much longer time
5. Not sure if his charger is 100% ok
6. Not sure if the charging cable is ok or not
— and many more charging questions

See part 2 here:

part 2 – cable problems