I built a battery and measured the current and voltage of the battery over time. Is there a way I can use this information easily to calculate the ampere hour capacity of the battery?

  • \$\begingroup\$ Yes there is... \$\endgroup\$
    – user16324
    Commented Jan 2, 2021 at 18:00
  • \$\begingroup\$ Ah capacity is normalized for a 20h discharge. You can compute Ah or AVh=Wh in a spreadsheet \$\endgroup\$ Commented Jan 2, 2021 at 18:14
  • \$\begingroup\$ Asking for a link to another resource makes this a shopping question. VTC. \$\endgroup\$ Commented Jan 2, 2021 at 18:20

1 Answer 1


Just integrate the current as a function of time, and express the result in ampere-hours. If the current is constant you can just multiply the current by the length of time, in hours, that the battery supplied this current.

  • \$\begingroup\$ Thank you, do you happen to know of an easy way to integrate the data using the data points? \$\endgroup\$ Commented Jan 2, 2021 at 18:05
  • \$\begingroup\$ Search the interwebs for "trapezoidal approximation". \$\endgroup\$ Commented Jan 2, 2021 at 18:10
  • \$\begingroup\$ Sorry for asking a lot of questions, but if I integrate current over time in seconds and divide the value by 3600, would I then get the amp-hour capacity of the battery? \$\endgroup\$ Commented Jan 2, 2021 at 18:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.