DARKBEAM LED Headlamp High Lumens USB Rechargeable Dual Light Headlight for Hardhat with Motion Sensor, Digital Power Display, Up/Down Adjustable, Waterproof Head Lamps for Camping, Repairs, 2 Pack

I have a bunch of 18650 and 21700 battery rechargeable headlamps. They are great for use when moving around. Having said this, when working on watches and craft projects, one of the most useful headlamps I find myself using again and again is this inexpensive, featherweight light. It's adjustable, fairly powerful, has a digital display battery level indicator, it doesn't get hot, and you don't even notice the weight. The only negative is that up time before dimming is about half of an 18650-based light due to battery size, so I keep 2 charged up and swap off. Very useful light. Pack of 2 for $20.00