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@IdealStandard I've used one for a few audaxs instead of my dynamo setup. Used it on LEL as well and took 4 spare batteries. Worked great.
If you're gonna buy spare 21700 get decent ones, like from https://www.torchy.co.uk/product-category/21700-batteries/ (targeted towards vape users now)
One of the forum ultra people recommends them, too. Frank?