The new Robbe Ro-Power ULTRA HP and MAXAMP are selected high-performance cells with a novel chemical composition. They have a very low internal resistance and maintain their voltage even under high loads. Of course, the packs are manufactured with the highest quality standards and careful selection of the best components. This also allows us to guarantee a very high cycle stability. The discharge currents (C-rates) are intentionally kept very conservative, allowing for continuous discharge. The relatively low weight is another advantage of the Robbe Ro-Power ULTRA series. The ULTRA HP series is designed for all standard requirements in the entire RC sector with a rating of 25(50)C. The MAXAMP series, rated at 35(70)C, is even more robust and is used in high-performance applications where higher currents and voltage stability under load are required.