ah (amp hour)

Definition: An ampere hour (abbreviated Ah, or sometimes amp hour) is the amount of energy charge in a battery that will allow one ampere of current to flow for one hour. An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor.

1 ah = 1000 mah

Bldc Tool

An open source software package to program and interface with VESC esc.


Definition: the ratio of the useful work performed by a machine or in a process to the total energy expended or heat taken in.



Electronic Speed Controller – used to control the speed of a BLDC motor, most commonly reads input from pwm/ppm signal.

Hub motor

A motor placed inside the wheel or wrapped with polyurethane. Direct drive hubs are the most common, with the exception being staryboard inline planetary gear system.


A flexible compound commonly cast from resin to make wheels, bushings, and pivot cuts for trucks. Hardness range from 75A for soft  longboard wheels to 90A+ for skate wheels or bushings.


Vedder’s Electronic Speed Controller (VESC).

open source ESC created by Benjamin Vedder,  The VESC is a general purpose BLDC ESC build around the STM32F4 microcontroller and a customized firmware based on ChibiOS. Settings can be customized for your application and motor by using the BLDC tool application, available on OSX, Windows, and Ubuntu.

w-hr (watt hour)

a measure of electrical energy equivalent to a power consumption of one watt for one hour.


pack voltage (V) * pack capacity (ah) = pack energy (watt-hours)