The DL3000 series makes battery testing simple and easy with the built in battery test function.
To learn more about the DL3000 series electronic load: https://beyondmeasure.rigoltech.com/acton/fs/blocks/showLandingPage/a/1579/p/p-0036/t/page/fm/0
DL3000 series product page: https://www.rigolna.com/products/dc-power-loads/dl3000/