They use several types: D (zinc carbon) cells, CR2032 lithium coin cells, AAA cells (including zinc-carbon AAA), AA alkaline packs, and rechargeable lithium-ion cells.
Brightness varies widely across models: listed lumen values range from about 7 lumens up to 250 lumens, with many options between those extremes.
Options include battery-only models (some sold with included batteries), rechargeable units with built-in lithium batteries, solar-rechargeable lanterns, and at least one model with a USB-C charging port.
Some lights are simple one-way on/off models, while others offer dimmable full-range settings or multiple modes such as low, medium, and high.
Many items are small, lightweight and pocketable or packable; listings note small footprints and reviewers frequently describe them as compact and easy to carry or stow.
