The Gens Ace Bashing Pro 4s has been specifically designed for Arrma vehicles which can utilize a high capacity battery such as this - specifically the Kraton 8S vehicles, and others which can accept this large capacity battery. All GensAce batteries offer superior cell matching at the factory, and are extremely consistent in selecting matched cells after each and every batch produced. Additionally, low internal resistance (IR), offers modelers stable voltage output through the whole duration of the battery. (Dimensions: 178x51x51mm (LxWxH)