Review on 🌞 SunJack 15W Portable ETFE Monocrystalline Solar Charger for Cell Phones, Tablets - Waterproof, Foldable for Backpacking, Camping, Hiking & More by Shawn Welker

Works much better than expected. It took about a day to charge my 25000mah battery from 0 to 100%. Looks pretty slow, but considering most other solar panels take anywhere from 2-3 days to almost a full week a day, that's pretty quick. Haven't tested it in the field, not in the backyard but will be soon but seems pretty solid and we'll get through it.