Create a Battery Tester

Want to know if your batteries still have some life? Create your own battery tester

Steps

  1. Get some enameled copper wire or wire obtained from the inside of a tube light choke. Don't worry about the length.
  2. Wind the wire over a tumbler and remove, so that it takes the form of a spiral.
  3. Attach the spiral together by a string at two or more places, leaving the ends open, and fix it vertically over a board.
  4. Tie a razor blade (or any lightweight, conductive metal) with a string horizontally and hang it at the top of the wound coil such that the blade is parallel to the coil.
  5. Connect the two ends of the coil to any torch or other battery. The blade should deflect if there is current in it. If not deflected then it is a waste battery.

Tips

  • Deflection will be more for a new battery.
  • Blade should be at the centre of the coil.
  • Clean the bare ends of the coil.
  • Blade should be parallel to the coil.

Warnings

  • Kids should do with adult supervision

Things You'll Need

  • coil,razor blade, string, battery, board for fixing

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