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batteryless dry . Chrisman / January 15, 2018.

Excellent but expensive. DIY . Batteries: 1×. Price Paid: ~$3.

Underwater USD507366(s).

https://en.wikipedia.org/wiki/Headlamp

Lighting Finder | Energizer

Zbattery Battery Supply | Bulk AA, AAA, 9V batteries | Maglite

LED Headlamps and Headlights – Energizer