They have an outstanding solar efficiency rating, up to 23.5% thanks to the high-quality A-Grade Monocrystalline Solar Cells used. Included controller built-in imported chips from the United States, which can charge lithium batteries, lead-acid batteries, and deep cycle batteries. Most models on the market can only charge lead-acid batteries. The panels feature the PET films, which have a 95% light penetration, minimizing the impact on solar output. Highly durable, impact-resistant, and shatterproof, making them the most heavy-duty portable solar option on the market. Super light, weight around 80% lesser than equivalent Glass solar panels on the market. Solar Controller with battery clips can be connected directly to AGM, Lead Acid, Gel & Calcium batteries. Foldable design.small size with big power.Totally portable for camping outings.