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Ive not read about it yet. I’ve never tracked the miles because I am not concerned about running out. I carry a spare battery just in case on my gravel bike(full disclosure I don’t have one now but will in a few weeks), but I’ll probably not carry spares on my mtb once I convert it next week with a dropper and rear derailleur. It sounds neat but I’ve no use for it. I could see it useful for any type of longer distance riders.
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