A Charge value represents an electrical charge in coulombs or ampere
hours. It is stored as a number of coulombs.
Construct a charge from a number of coulombs.
Convert a charge to a number of coulombs.
Construct a charge from a number of ampere hours.
Convert a charge to a number of ampere hours.
Construct a charge from a number of milliampere hours.
Convert a charge to a number of milliampere hours.