My wife "Bash" took her Bashblaster light for a ride.
She came up with a very smart solution for attaching the battery:
<a href="https://picasaweb.google.com/lh/photo/_nTCVOefuRZUkH3nJQ10aNMTjNZETYmyPJy0liipFm0?feat=e mbedwebsite"><img src="https://lh6.googleusercontent.com/-sojrcEO50Qk/UPflH-cjBjI/AAAAAAAABkE/vwz4pH6Stk0/s400/image.jpg" height="299" width="400" /></a>
It's a water-resistant iPhone armband holder.
Anything from a 1-cell to 4-cell battery will just drop in there.
Note the high mount for the light- she mainly uses it for ultra-running and 24hr orienteering, and likes it high on the headband. She has a 6-day nonstop multi sport race in Patagonia upcoming, so I'll be setting her up with a lot of batteries, and needs to be able to change them easily in the dark, cold and rain.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Great helmet battery holder