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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?

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  • \$\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

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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.

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  • \$\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

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