You’ll need:

  • a Panasonic CR1220 battery, or equivalent.
  • a Pozidriv PZ00, or similarly sized, phillips screw driver.
  • a bowl

Key in bowlTaking the key apart is self-explanatory, just undo the screws.

This is where the bowl comes in.  You want to unscrew the screws in a dish, or a tray.  This is because they are about the same size as a pencil lead tip.

And if you drop them on carpet, you’ll waste time trying to find them.  Drop the screws onto a tiled floor, and they’ll bounce and bounce and bounce away.

Gently lever the battery out, and place the new battery in.

Put the screws back in, and you’re done.

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