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2. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   This battery, introduced in 1901, was very common in continental Europe until the 1970s. It usually contains three B cells in series. In Switzerland as of 2008, 4.5-volt batteries account for only 1% of primary battery sales. [89] PP3, 9-volt, or E [90] Radio battery Smoke alarm battery Square battery Transistor battery 006P MN1604

3. Battery torque wrench - Wikipedia

   en.wikipedia.org/wiki/Battery_torque_wrench

   The largest Battery torque wrench ever was invented and manufactured in Germany in 2013. It is capable of 31,000 Ft lbs of power with a 2.5 inch square drive output. Torque capabilities of battery torque wrenches range from 30 Nm, up to a maximum of 42.000 Nm (20 Ft. Lbs - 31.000 Ft. Lbs). The first battery torque wrench with a brushless motor ...

4. Brushless DC electric motor - Wikipedia

   en.wikipedia.org/wiki/Brushless_DC_electric_motor

   Brushless motors are found in many modern cordless tools, including some string trimmers, leaf blowers, saws (circular and reciprocating), and drills/drivers. The weight and efficiency advantages of brushless over brushed motors are more important to handheld, battery-powered tools than to large, stationary tools plugged into an AC outlet.

5. Brushed DC electric motor - Wikipedia

   en.wikipedia.org/wiki/Brushed_DC_electric_motor

   This increases the zero-torque range of angular positions but eliminates the shorting problem; if the motor is started spinning by an outside force it will continue spinning. With this modification, it can also be effectively turned off simply by stalling (stopping) it in a position in the zero-torque (i.e. commutator non-contacting) angle range.

6. 18650 battery - Wikipedia

   en.wikipedia.org/wiki/18650_battery

   An 18650 battery [1] or 1865 cell [2] is a cylindrical lithium-ion battery common in electronic devices. The batteries measure 18 mm (0.71 in) in diameter by 65 mm (2.56 in) in length, giving them the name 18650. [3] The battery comes in many nominal voltages depending on the specific chemistry used.

7. Direct-drive mechanism - Wikipedia

   en.wikipedia.org/wiki/Direct-drive_mechanism

   The main drawback is that a special type of electric motor is often needed to provide high torque outputs at low rpm. Compared with a multi-speed transmission, the motor is usually operating in its optimal power band for a smaller range of output speeds for the system (e.g., road speeds in the case of a motor vehicle).