ucUnitCloudInternational unit matrix

Use case

Battery, charge and energy content

Keep mAh, Ah and Wh cleanly apart so that batteries and power banks become comparable.

Working steps

  1. Bring the charge figure into one consistent unit: mAh or Ah.
  2. Find the nominal voltage of the battery — without it no energy statement is possible.
  3. Compute energy in Wh: Ah times volts.
  4. For power banks also check whether cell capacity or the 5 V output is stated.
  5. To compare several batteries always put the Wh figures side by side, not the mAh figures.

Checks

Unit family: Electric charge

Matching conversions

Milliampere hour to Ampere hourmAh → AhElectric chargeAmpere hour to Milliampere hourAh → mAhElectric chargeAmpere hour to CoulombAh → CElectric chargeMilliampere hour to CoulombmAh → CElectric chargeKilocoulomb to Ampere hourkC → AhElectric charge

Further reading

TableBattery capacity: mAh and WhGuideComparing batteries: mAh, Ah and Wh

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.
When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, use case, sources reviewed: September 2026. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.