Jump-N-Carry is a great brand. You can visit
http://www.cloreautomotive.com to learn more about the Jump-N-Carry brand and others (Booster PAC and Truck PAC) They are professional units sold to mechanics and are designed specifically for jumpstarting. They are sold generally through Snap-On, Matco, Mac Tools but you should be able to find a website that sells via the internet. The Jump-N-Carry 660 should be able to start the H2 20-30 times on a single charge. If you have any additional questions please ask and I will be happy to answer. Let's just say I'm close to the inventor of this product.
Micro.