Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to make a magnetic induction battery charger [title] Get some rechargeable batteries. [step] Non rechargeable batteries will explode if charged. [title] Go to an electronics hobby store and buy the following items : [substeps] Battery holder for the type you wish to charge electrical wiring, preferable uninsulated, but if it isn't you need to strip the insulation off.

Ending1: Batteries will usually always have an attachment, usually they attach on to the centre of the battery carrier. A backup circuit for when there is an emergency, without them attached not only gives it power but also helps your battery last longer. Ending2: Begin by soaking and pressing the battery with a circular or pebbles coloured gel. Feel the cooling it and remove the 4 plastic screws holding it in place. Ending3: [title] Now you will need to acquire these mechanical parts. [substeps] A hand crank something to mount the hand crank to, but make sure it can still rotate. Ending4: Wire gloves, polyurethane-clear plastic tubing, wire cutters, pliers, and masking tape. Triple screw onto-auto fitting charger.

Answer format: ending1/ending2/ending3/ending4