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A comment on Ohm (YC S15) is a smarter, lighter car battery that works with your existing car. Parent comment

Re:Ohm (YC S15) is a smarter, lighter car battery that works... by fn42 on Wednesday August 12, 2015 @03:48PM (#10050179)
Not exactly -30 but I know this guy had some success with off the shelf caps: https://www.youtube.com/watch?v=GUXM1XuLUIs

There's a few other vids on this topic if you search through the channel

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