The most important figure when comparing how far a specific battery pack

will take you is not the amp-hour capacity, but rather the total energy

stored watt-hours.One watt-hour is equal to one thousandth of a

kilowatt hour, the unit of electricity used to quantify household

electrical usage.The watt-hours stored in a battery pack are estimated

by multiplying the actual amp-hours by the pack voltage.

If you want to travel farther, simply increase the voltage. This will

eliminate the need for a greater number of amp-hours. So a 24V 8Ah

battery can deliver 192 watt-hours, while a 36V 5.5 AH pack also has

roughly 192 watt-hours. Assuming that both batteries are of the same

chemistry, you may anticipate them to weigh about the same, cost roughly

the same, and provide approximately the same performance on properly

designed ebikes (i.e., ones designed for 24V and 48V)

The watt-hours commonly seen in retail ebikes is around 192. This is generally the smallest battery size recommended for an

ebike. Many of the store-bought ebikes have about this much capacity

since it keeps the battery cost down. For people who want to ride longer distances or

commute reasonable lengths of 25 miles or more, we would recommend a minimum of 300 watt-hours. This number can vary a lot with usage habits, and you can get a lot further using the bike as a pedal assist. For educational purposes an

energy consumption of 8-9 watt-hrs / mile is typical on most ebikes.