Over time, it is a normal occurrence that the battery does not charge properly. Chances are that's our fault. Usually a cable problem, or adapter. If the adapter has many years, it may have been broken, and we have to buy a new one. You may also be a cable problem, so it is best to try using another cable to see if it works the right way. If not, chances are you've broken the microUSB connection smartphone. In this case, there are many possible solutions. An external battery charger, if a removable battery and a second battery, could be the solution.