If you haven’t ridden or even seen a modern eMTB, here is what I have discovered. They are sturdy rigs that come standard with quality mountain bike components including beefy forks and rear suspension systems, strong disk brakes, and a reliable drivetrain. They are heavy but not that far out of the old downhill bike weight class. The distinguishing “e” features are the electric motor at the bottom bracket (some have hub motors), the battery pack, and the handlebar-mounted computer that controls the system. They have adjustable assist modes: off, low (barely helps), medium, and the battery-draining high mode. When everything is put together, they are something to behold.
Weight isn’t anything like a critical as one would assume. Weight distribution however is a different matter and this is where geometry, specifically the ratio of the front centre measurement to the chain stay length really comes into play. Battery placement is important too, and smaller batteries give an edge in the handling stakes while robbing the bike of range.
Mountain electric bikes can even be used for commuting to work or going to the grocery store.  When choosing a mountain eBike, make sure that you pick one that has at least 500 to 750 watts of power. Having a powerful motor to assist you on the trail will keep your legs from being sore at the end of the day. This will ensure that you get the most out of your bike and be able to drive across rocks and logs with ease. 
Controllers for brushed motors: Brushed motors are also used in e-bikes but are becoming less common due to their intrinsic lower efficiency. Controllers for brushed motors however are much simpler and cheaper due to the fact they don't require hall sensor feedback and are typically designed to be open-loop controllers. Some controllers can handle multiple voltages.
E-bikes can be a useful part of cardiac rehabilitation programmes, since health professionals will often recommend a stationary bike be used in the early stages of these. Exercise-based cardiac rehabilitation programmes can reduce deaths in people with coronary heart disease by around 27%;[55] and a patient may feel safer progressing from stationary bikes to e-bikes.[56] They require less cardiac exertion for those who have experienced heart problems.[57]
Your friends: We all have friends we wish wanted to pedal up hills with us. Many of who might be capable of leaving us in their dust on descents. These are young and old riders; riders lacking the fitness, time, motivation, or who just aren’t interested in climbing alone, at the back of the pack. You’ve done everything to get them back out riding with your regular crew, but pride and reluctance to hold the group back is keeping them away. 
While GM and Tesla are getting their toes wet, or at least implying that they might, and Ducati is at the table with a serious range of electric bikes, Yamaha is the Japanese entrant to the market. But this isn’t new news. The company has sold over 2 million electric bicycles globally, as well as 4 million drive units. It is a big player in this space and has been since it started. As with Ducati, you can’t buy an electric motorcycle from the motorcycle-heavy brand, but you can power up hills on road and off with one of their motorized products.
REBEL electric bikes powered by the Yamaha central motor create Dynamic and Responsive Power. It also enables the use of a conventional groupset and offers no resistance in «no assistance» mode. The eMTB bikes range have an “External DT System” battery, located in the front triangle and integrated with the design of the frame. The relative position of the less lightweight parts of the system (motor and battery) enables a low center of gravity, guaranteeing a reactive and stable ebike. See the REBEL electric bike models...
The Ancheer folding electric mountain bike does have a few weird quirks. The first is the handlebar mounted battery. It saves space for the folding mechanism, but looks odd. Fortunately it has very little effect on handling because it is mounted so close the head tube’s pivot point. It does raise the center of gravity of the bike a bit, but the difference is small compared to how much you raise the bike’s center of gravity.
E-bikes are classed according to the power that their electric motor can deliver and the control system, i.e., when and how the power from the motor is applied. Also the classification of e-bikes is complicated as much of the definition is due to legal reasons of what constitutes a bicycle and what constitutes a moped or motorcycle. As such, the classification of these e-bikes varies greatly across countries and local jurisdictions.
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