I purchased this solar battery bank to power my GPS, phone and flashlights while hiking for multiple days. I strapped it to the outside of my pack and it maintained a full charge in the sun and provided more than enough power for all my electronic devices. The light is adequate if needed, and the bank is sturdy. A little heavy but the peace of mind of plenty of power is worth it. It sits in the sun on the window sill when not in use and I’ve never seen it low on power.