Convert electric charge and battery capacity units including Coulombs (C), Milliampere-hours (mAh), Ampere-hours (Ah), Faradays, and Elementary Charge.
10,000 Millicoulomb
Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. In the SI system, electric charge is measured in Coulombs (C). One Coulomb is equal to the amount of charge transferred by a current of 1 ampere flowing for 1 second (1 C = 1 A·s).
Consumer batteries specify capacity in milliampere-hours (mAh) or Ampere-hours (Ah). This indicates how much current the battery can deliver over time. A 4,000 mAh smartphone battery can theoretically deliver 4,000 mA (4 A) for 1 hour, or 400 mA for 10 hours before fully discharging.
In electrochemical reactions such as anodizing, electroplating, and lithium-ion intercalation, charge transfer is related to moles of material by Faraday's constant (F ≈ 96,485 C/mol). Depositing 1 mole of copper from a Cu²⁺ solution requires 2 Faradays (192,970 Coulombs) of electric charge.
There are exactly 3.6 Coulombs in 1 milliampere-hour (mAh). Since 1 hour = 3,600 seconds and 1 milliamp = 0.001 Amp, 0.001 A × 3,600 s = 3.6 C. A 5,000 mAh smartphone battery stores 18,000 Coulombs of charge.
Multiply the Ampere-hour (Ah) value by 1,000. For example, a 60 Ah car battery equals 60,000 mAh.
A Faraday is the total electrical charge carried by one mole of electrons (approx 96,485.332 Coulombs), fundamental in chemistry calculations for electrolysis and electroplating.
One Coulomb of electrical charge consists of approximately 6.2415 × 10¹⁸ elementary charges (electrons).
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