Providing the ultimate in nickel-metal hydride technology, dynamite speedpack 2 sport packs are an extremely affordable choice for everyone from rc hobbyists to sport-level racers. They feature capacity ratings ranging from 1800mah to 5100mah, making it easier than ever to choose the right ni-mh battery for your vehicle. Additionally, speedpack 2 batteries are fully compatible with the dynamite dashboard app. The dynamite dashboard app seamlessly integrates the batteries with the dynamite passport series of chargers and brings real-time monitoring to your mobile device.