This guidance is for choosing batteries for general practical circuit work, where pupils experiment with low-voltage circuits by connecting batteries , torch bulbs, buzzers, small motors and other low-power components to investigate electrical characteristics, parallel and series circuits, etc. 

The design and construction of items which will be connected to the mains supply where the use of electricity is peripheral or fundamental (eg, low-voltage power supplies for electronics).Instruction in the repair and maintenance of equipment.The construction of electronics circuits from prepared modules or components.

Drilling holes in resistant materials. Most portable power tools are electrically operated but pneumatic tools are used where compressed air is available. The use of tools with integral low-voltage battery packs is increasing.

This is a 'make-it' guide for constructing a DC motor from easily sourced components and 3D printed parts.

The 3D print files are available from GL365A listed below.