Both the 2010 MX Sport and MX Extreme use the patented Z-Force lithium-ion Intelligent Power Pack as its fuel cell. The maximum capacity of the power pack is two kWh, with a nominal capacity of 1.7 kWh. The charge time is two hours as a standard when using 110v; however, the optional quick charger uses 220v, and allows the power pack to be charged 100 percent in 1.2 hours. Runtime ranges from 45 minutes to two hours, and is heavily dependent on the style of the rider. The Power Pack has an estimated life of 1215 hours, or 29,000 miles. Swapping out the 45 pound battery is a very quick operation, taking only two minutes. However, at close to 3000 dollars each, it can be expensive to keep multiple spares close at hand.