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Basically this.
I've got 1.5v and 3v on different bikes, not much difference between them in terms of vision, just can't charge off the 1.5v. Recently I don't even bother doing that off the 3v anyway unless doing 600k+ rides, anything else a big Anker battery is quicker to charge and lasts long enough.
mustardbeak
Is that true though? I thought 1.5w was only a problem if you want to charge.