This is dependent on knowing the make, model and memory capacity of the device as well as functioning condition. Best average is about 1.5 hours but they have gone up to 6 hours.

  • The battery should be as close to  100% as possible.
  • The data (charging port) needs to functioning normally.
  • How much does the device owner use it and for what purpose?
  • What is Memory capacity of the device?