Planning to spend a lot of time off-grid with your gadgets? A decent solar charger can help keep your gadgets charged. The HeLi-on solar charger is a highly compact device that fits in your pocket. It comes with a rollable solar charger and a battery to store energy for your gadgets. HeLi-on lets you charge your smartphone in about 3 hours.This charger lets you charge your gadgets directly from sunlight or use the internal battery when the sun is down.