Originally Posted by
lynchy
That is excellent marketing. Sell someone the lightest, therefore smallest capacity and cheapest battery along with a small motor and charge a premium price because it's light. Li-ion or LiFePO4 are limited to a certain energy density. There's no magic, it's just a small battery. 91Wh so likely 24V and less than 4Ah.
That is a good point. Another aspect of low capacity Lithium batteries is that they do not age well. Most manufacturers save weight by installing batteries that are undersized for the power drawn and therefore working too hard. This reduces the lifecycle of the battery. Going with lower voltages is OK as long as long as the motor is designed for high RPM's. I am an ebike manufacturer and I am not a big fan of hub motors, they are heavy and waistfull on low RPM's, harder to pedal, changing tires is a pain and they seem to be running into more of flats. I am installing 15Ah for my 350Watts bikes and 10Ah for my 250Watts European model. I know it is the policy of this forum to not post any links so I'll just leave you with the name: NEO VELOX