E-bikes use rechargeable batteries, electric motors and some form of control. Battery systems in use include sealed lead-acid (SLA), nickel-cadmium (NiCad), nickel-metal hydride (NiMH) or lithium-ion polymer (Li-ion). Batteries vary according to the voltage, total charge capacity (amp hours), weight, the number of charging cycles before performance degrades, and ability to handle over-voltage charging conditions. The energy costs of operating e-bikes are small, but there can be considerable battery replacement costs. The lifespan of a battery pack varies depending on the type of usage. Shallow discharge/recharge cycles will help extend the overall battery life.
The distance range of an electric mountain bike refers to the distance you can travel on a single battery charge given a specific set of circumstances. All of the e-bikes we tested have roughly the same battery storage capacity, but outside variables like rider weight, pedaling input, terrain, trail conditions, and weather conditions may all affect the length of time or distance that a battery charge will last. To compare the distance range of the four models in our test we took the bikes out in their highest support setting and did out and back laps on the same trail until the batteries ran down from fully charged to completely dead. When we finished we recorded the distance and vertical gain that each model was able to complete and easily and objectively determined our winner.
This isn't just the lightest mountain bike frame we've ever made, it's our lightest frame—period. The Men's Epic Hardtail was redesigned from the ground-up to give you an unparalleled performance advantage on the XC track. It flies up hills with ease, sends descents with confidence, and wastes nary a watt. Consider it a cross country revolution, and remember, this is going to be epic.
Adam Boesel, inventor of the UpCycle Ecocharger, is using Electric Bike Tech hub motors and working with GM and Chevrolet to build bicycle generators featured at the 2015 Pan Amercian Games!   Adam Boesel is using Electric Bike Technologies hub motors on bicycles that generate electricity! Now General Motors has taken his idea to the 2015 Pan American Games and is using them to show people how PLAY can literally...

Depending on local laws, many e-bikes (e.g., pedelecs) are legally classified as bicycles rather than mopeds or motorcycles. This exempts them from the more stringent laws regarding the certification and operation of more powerful two-wheelers which are often classed as electric motorcycles. E-bikes can also be defined separately and treated under distinct Electric bicycle laws.