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I am trying to estimate battery weights for electric pump fed rockets of various sizes and wanted to use the electron rocket as data to validate my calculations. However I was unable to find the mass of the battery pack that delivers the power for the 9 Rutherford engines in the Electron rocket.

Does anybody know where to find this data or know a reasonable estimate?

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    $\begingroup$ Are the ejected first stage Electron rocket batteries really incinerated? links to Spaceflight 101's Electron The first “battery-powered” Rocket but at 1st glance no answer pops out though there are clues towards a minimum size: "Each of the small motors, about the size of a soda can, delivers 50 horsepower (37kW) when spinning at 40,000 RPM" & "A disadvantage of the design is the heavy battery required to drive the pumps" & "Each engine assembly, without battery, weighs approximately 20 Kilograms" $\endgroup$ – uhoh Nov 23 '20 at 10:32
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    $\begingroup$ Thanks a lot for the links! Although they haven't really given me the battery mass, they hold a lot of useful info $\endgroup$ – Ruben Dec 19 '20 at 17:10

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