![Testing out the new Electron Cycles Marathon battery which claims to make a stock Surron 8mph faster without aftermarket controller needed .. (video link in comments) : r/Surron Testing out the new Electron Cycles Marathon battery which claims to make a stock Surron 8mph faster without aftermarket controller needed .. (video link in comments) : r/Surron](https://preview.redd.it/testing-out-the-new-electron-cycles-marathon-battery-which-v0-zftnori3bd4a1.jpg?width=1080&crop=smart&auto=webp&s=e7fe3550ac3c2e86d6814f271d208b3319730ceb)
Testing out the new Electron Cycles Marathon battery which claims to make a stock Surron 8mph faster without aftermarket controller needed .. (video link in comments) : r/Surron
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